Common Weakness Enumeration
CWE-400
DiscouragedUncontrolled Resource Consumption
Abstraction: Class · Status: Draft
The product does not properly control the allocation and maintenance of a limited resource.
6394 vulnerabilities reference this CWE, most recent first.
CVE-2026-1605 (GCVE-0-2026-1605)
Vulnerability from cvelistv5 – Published: 2026-03-05 09:39 – Updated: 2026-09-14 12:04
VLAI
EPSS
VEX
Summary
In Eclipse Jetty, versions 12.0.0-12.0.31 and 12.1.0-12.0.5, class GzipHandler exposes a vulnerability when a compressed HTTP request, with Content-Encoding: gzip, is processed and the corresponding response is not compressed.
This happens because the JDK Inflater is allocated for decompressing the request, but it is not released because the release mechanism is tied to the compressed response.
In this case, since the response is not compressed, the release mechanism does not trigger, causing the leak.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-05 14:46 UTC
CWE
Assigner
References
20 references
Impacted products
45 products
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | Eclipse Jetty |
Affected:
12.0.0 , ≤ 12.0.31
(semver)
Affected: 12.1.0. , ≤ 12.1.5 (semver) |
|
| Red Hat | HawtIO HawtIO 4.4.0 |
cpe:/a:redhat:apache_camel_hawtio:4.4::el9
|
|
| Red Hat | Red Hat AMQ Broker 7.14.0 |
cpe:/a:redhat:amq_broker:7.14
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 |
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 |
Unaffected:
0:2.40.0-7.redhat_00015.1.el8eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 |
Unaffected:
0:801.6.1-1.GA_redhat_00001.1.el8eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 |
Unaffected:
0:2.3.24-3.SP2_redhat_00001.1.el8eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 |
Unaffected:
0:8.1.6-7.GA_redhat_00010.1.el8eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el8 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 |
Unaffected:
0:2.40.0-7.redhat_00015.1.el9eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 |
Unaffected:
0:801.6.1-1.GA_redhat_00001.1.el9eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 |
Unaffected:
0:2.3.24-3.SP2_redhat_00001.1.el9eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9 |
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 |
Unaffected:
0:8.1.6-7.GA_redhat_00010.1.el9eap , < *
(rpm)
cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.12 |
Unaffected:
1786628667 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.12::el8 |
|
| Red Hat | OpenShift Developer Tools and Services 4.13 |
Unaffected:
1786628681 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.13::el8 |
|
| Red Hat | OpenShift Developer Tools and Services 4.14 |
Unaffected:
1786533561 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.14::el8 |
|
| Red Hat | OpenShift Developer Tools and Services 4.15 |
Unaffected:
1786533565 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.15::el8 |
|
| Red Hat | OpenShift Developer Tools and Services 4.16 |
Unaffected:
1787125166 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.16::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.17 |
Unaffected:
1787124635 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.17::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.18 |
Unaffected:
1787125069 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.18::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.19 |
Unaffected:
1787124632 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.19::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.20 |
Unaffected:
1787124925 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.20::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.21 |
Unaffected:
1787125311 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.21::el9 |
|
| Red Hat | OpenShift Developer Tools and Services 4.22 |
Unaffected:
1787124779 , < *
(rpm)
cpe:/a:redhat:ocp_tools:4.22::el9 |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.28 |
Unaffected:
1779528224 , < *
(rpm)
cpe:/a:redhat:openshift_devspaces:3.28::el9 |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.28 |
Unaffected:
1779359423 , < *
(rpm)
cpe:/a:redhat:openshift_devspaces:3.28::el9 |
|
| Red Hat | OpenShift Developer Tools and Services |
cpe:/a:redhat:ocp_tools
|
|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 |
cpe:/a:redhat:camel_spring_boot:4
|
|
| Red Hat | Red Hat build of Apicurio Registry 2 |
cpe:/a:redhat:service_registry:2
|
|
| Red Hat | Red Hat build of Apicurio Registry 3 |
cpe:/a:redhat:apicurio_registry:3
|
|
| Red Hat | Red Hat build of Debezium 2 |
cpe:/a:redhat:debezium:2
|
|
| Red Hat | Red Hat build of Debezium 3 |
cpe:/a:redhat:debezium:3
|
|
| Red Hat | Red Hat Data Grid 8 |
cpe:/a:redhat:jboss_data_grid:8
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
|
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack |
cpe:/a:redhat:jbosseapxp
|
|
| Red Hat | Red Hat JBoss Web Server 6 |
cpe:/a:redhat:jboss_enterprise_web_server:6
|
|
| Red Hat | Red Hat Offline Knowledge Portal |
cpe:/a:redhat:offline_knowledge_portal:1
|
|
| Red Hat | Red Hat Process Automation 7 |
cpe:/a:redhat:jboss_enterprise_bpms_platform:7
|
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6
|
|
| Red Hat | Red Hat Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
|
| Red Hat | streams for Apache Kafka 2 |
cpe:/a:redhat:amq_streams:2
|
|
| Red Hat | streams for Apache Kafka 3 |
cpe:/a:redhat:amq_streams:3
|
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CVE-2026-1174 (GCVE-0-2026-1174)
Vulnerability from cvelistv5 – Published: 2026-01-19 20:02 – Updated: 2026-02-23 08:48
VLAI
EPSS
VEX
Title
birkir prime GraphQL Alias graphql resource consumption
Summary
A vulnerability was determined in birkir prime up to 0.4.0.beta.0. This affects an unknown function of the file /graphql of the component GraphQL Alias Handler. This manipulation causes resource consumption. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-20 14:44 UTC
Assigner
References
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| https://vuldb.com/?submit.731105 | third-party-advisory |
| https://github.com/birkir/prime/issues/545 | exploitissue-tracking |
| https://github.com/birkir/prime/ | product |
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CVE-2026-0992 (GCVE-0-2026-0992)
Vulnerability from cvelistv5 – Published: 2026-01-15 14:20 – Updated: 2026-09-01 12:10
VLAI
EPSS
VEX
Title
Libxml2: libxml2: denial of service via crafted xml catalogs
Summary
A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 16:31 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:7519 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-0992 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2429975 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/libxml2/-/issues/1019 |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
Unaffected:
2.15.2-0.3.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat JBoss Core Services |
cpe:/a:redhat:jboss_core_services:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
Date Public
2026-01-15 00:00
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CVE-2026-0599 (GCVE-0-2026-0599)
Vulnerability from cvelistv5 – Published: 2026-02-02 10:36 – Updated: 2026-02-02 12:49
VLAI
EPSS
VEX
Title
Unbounded External Image Fetch in Validation Leads to Resource-Exhaustion DoS in huggingface/text-generation-inference
Summary
A vulnerability in huggingface/text-generation-inference version 3.3.6 allows unauthenticated remote attackers to exploit unbounded external image fetching during input validation in VLM mode. The issue arises when the router scans inputs for Markdown image links and performs a blocking HTTP GET request, reading the entire response body into memory and cloning it before decoding. This behavior can lead to resource exhaustion, including network bandwidth saturation, memory inflation, and CPU overutilization. The vulnerability is triggered even if the request is later rejected for exceeding token limits. The default deployment configuration, which lacks memory usage limits and authentication, exacerbates the impact, potentially crashing the host machine. The issue is resolved in version 3.3.7.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-02 12:48 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| huggingface | huggingface/text-generation-inference |
Affected:
unspecified , < 3.3.7
(custom)
|
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GCVE-1988-2026-0382
Vulnerability from gna-1988 – Published: 2026-09-11 11:55 – Updated: 2026-09-11 11:55
VLAI
EPSS
VEX
Title
Dovecot Security Advisory 3/2026
Summary
Hi!
We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those
vulnerabilities. This advisory will also be published at
https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html
---
Classification: TLP:GREEN
Internal reference: DOV-8476
Type: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2025-11-25
Solution date: 2026-08-26
Disclosure date: 2026-08-26
CVE: CVE-2026-33263
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
submission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file
descriptor. When mail_max_userip_connections is set (defaul
t 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.
Risk:
If running in high-security mode (default for community releases), only the new submission connection gets terminated.
If running in high-performance mode (default for Pr
o releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure
for user to send a message, or it can cause duplica
te messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries
cannot happen, because the crash can only happen at AUT
H stage. No publicly available exploits are known.
Solution:
Limit the number of connections handled by single submission-login process. This has a performance impact though.
Update to non-vulnerable version.
---
Internal reference: DOV-8874
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <3.0.7, OX Dovecot Pro core >=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0
<2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5
Discovery date: 2026-03-11
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ylwango613@yeswehack
CVE: CVE-2026-33607
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
Dovecot IMAP LIST match_sub() Exponential Backtracking — CPU Denial of Service. An attacker that has valid credentials
can use IMAP LIST command to consume CPU.
Risk:
This can cause degradation or denial of service for IMAP. No publicly available exploits are known.
Solution:
Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed
version.
---
Internal reference: DOV-8884
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-13
Solution date: 2026-08-26
Disclosure date: 2026-08-26
CVE: CVE-2026-27852
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
DoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain
a very large number of email addresses or MIME par
ameters, which causes excessive memory usage when the message is later parsed.
Risk:
The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it,
causing denial of service for the affected user. No
publicly available exploits are known.
Solution:
Update to non-vulnerable version.
---
Internal reference: DOV-8941
Type: CWE-93 (Improper Neutralization of CRLF Sequences ('CRLF Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: thanos_haruki@yeswehack
CVE: CVE-2026-33606
CVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)
Details:
dsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is
interpreted as dsync protocol commands when an administ
rator later runs dsync with the stream protocol, for example during a migration.
Risk:
Injected commands can modify mailbox state on the destination during migration or replication, including internal
mailbox attributes that a user should not be able to set
directly. It can also cause dsync errors. No publicly available exploits are known.
Solution:
Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.
---
Internal reference: DOV-8947
Type: CWE-655 (Insufficient Psychological Acceptability)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: heckintosh@yeswehack
CVE: CVE-2026-33604
CVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
Details:
SMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a
message, for example through Sieve redirect or submission
relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message
content from being interpreted as SMTP commands.
Risk:
A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of
the message body as new SMTP commands, allowing injec
tion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available
exploits are known.
Solution:
Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to
non-vulnerable version.
---
Internal reference: DOV-8949
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: djvirus@yeswehack
CVE: CVE-2026-40014
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
Details:
IMAP THREAD REFERENCES O(N²) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send
mail to a user can craft a message header that makes
the IMAP THREAD command consume CPU disproportionate to the size of the message.
Risk:
When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for
IMAP. No publicly available exploits are known.
Solution:
Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected
mailbox. Update to non-vulnerable version.
---
Internal reference: DOV-8991
Type: CWE-124 (Buffer Underwrite ('Buffer Underflow'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-04-02
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-40013
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
pigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid
credentials can submit a Sieve script containing an extreme
numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.
Risk:
This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for
script management. This might be able to be used for re
mote code execution. No publicly available exploits are known.
Solution:
Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.
---
Internal reference: DOV-8994
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-04-02
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-33605
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
managesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a
small malformed command before authenticating.
Risk:
If running in high-security mode (default for community releases), only the attacker's own connection is terminated. If
running in high-performance mode (default for Pro
releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause
denial of service for Sieve script management. No
publicly available exploits are known.
Solution:
Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.
---
Internal reference: DOV-9039
Type: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5
Discovery date: 2026-04-08
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: tipsennn@yeswehack
CVE: CVE-2026-40018
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
MySQL multi-byte escaping wrong. None
Risk:
None No publicly available exploits are known.
Solution:
None
---
Internal reference: DOV-9041
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot CE core >=2.4.3 <2.4.5
First fixed revision: OX Dovecot CE core 2.4.5
Discovery date: 2026-04-08
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-4
Severity
No CVSS data available.
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dovecot | Security Advisory |
Affected:
unknown
|
Relationships
reference
GCVE-1988-2026-0382 (this record)
- related CVE-2023-51764
- related CVE-2023-51766
- related CVE-2026-27852
- related CVE-2026-33263
- related CVE-2026-33604
- related CVE-2026-33605
- related CVE-2026-33606
- related CVE-2026-33607
- related CVE-2026-40013
- related CVE-2026-40014
- related CVE-2026-40015
- related CVE-2026-40017
- related CVE-2026-40018
- related CVE-2026-40019
- related CVE-2026-40203
- related CVE-2026-40204
- related CVE-2026-40205
- related CVE-2026-42007
- related CVE-2026-42008
- related CVE-2026-42391
- related CVE-2026-42392
- related CVE-2026-42393
- related CVE-2026-42395
- related CVE-2026-52681
- related CVE-2026-52687
- related CVE-2026-73208
- related CVE-2026-73209
{
"containers": {
"cna": {
"affected": [
{
"product": "Security Advisory",
"vendor": "Dovecot",
"versions": [
{
"status": "affected",
"version": "unknown"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Aki Tuomi"
}
],
"descriptions": [
{
"lang": "en",
"value": "Hi!\n\nWe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory will also be published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html\n\n---\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-8476\nType: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere (\u0027File Descriptor Leak\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2025-11-25\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-33263\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nsubmission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file \ndescriptor. When mail_max_userip_connections is set (defaul\nt 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.\n\nRisk:\nIf running in high-security mode (default for community releases), only the new submission connection gets terminated. \nIf running in high-performance mode (default for Pr\no releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure \nfor user to send a message, or it can cause duplica\nte messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries \ncannot happen, because the crash can only happen at AUT\nH stage. No publicly available exploits are known.\n\nSolution:\nLimit the number of connections handled by single submission-login process. This has a performance impact though. \nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8874\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.0.7, OX Dovecot Pro core \u003e=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \n\u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-03-11\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ylwango613@yeswehack\nCVE: CVE-2026-33607\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nDovecot IMAP LIST match_sub() Exponential Backtracking \u2014 CPU Denial of Service. An attacker that has valid credentials \ncan use IMAP LIST command to consume CPU.\n\nRisk:\nThis can cause degradation or denial of service for IMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed \nversion.\n\n\n\n---\n\n\n\nInternal reference: DOV-8884\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-13\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-27852\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nDoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain \na very large number of email addresses or MIME par\nameters, which causes excessive memory usage when the message is later parsed.\n\nRisk:\nThe message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, \ncausing denial of service for the affected user. No\n publicly available exploits are known.\n\nSolution:\nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8941\nType: CWE-93 (Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: thanos_haruki@yeswehack\nCVE: CVE-2026-33606\nCVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)\n\nDetails:\ndsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is \ninterpreted as dsync protocol commands when an administ\nrator later runs dsync with the stream protocol, for example during a migration.\n\nRisk:\nInjected commands can modify mailbox state on the destination during migration or replication, including internal \nmailbox attributes that a user should not be able to set\n directly. It can also cause dsync errors. No publicly available exploits are known.\n\nSolution:\nAvoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8947\nType: CWE-655 (Insufficient Psychological Acceptability)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: heckintosh@yeswehack\nCVE: CVE-2026-33604\nCVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)\n\nDetails:\nSMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a \nmessage, for example through Sieve redirect or submission \nrelay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message \ncontent from being interpreted as SMTP commands.\n\nRisk:\nA downstream mail server that hasn\u0027t yet fixed the SMTP smuggling vulnerability can be tricked into treating part of \nthe message body as new SMTP commands, allowing injec\ntion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available \nexploits are known.\n\nSolution:\nWhere you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to \nnon-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8949\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-40014\nCVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)\n\nDetails:\nIMAP THREAD REFERENCES O(N\u00b2) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send \nmail to a user can craft a message header that makes \nthe IMAP THREAD command consume CPU disproportionate to the size of the message.\n\nRisk:\nWhen a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for \nIMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected \nmailbox. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8991\nType: CWE-124 (Buffer Underwrite (\u0027Buffer Underflow\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-40013\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\npigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid \ncredentials can submit a Sieve script containing an extreme\n numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.\n\nRisk:\nThis causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for \nscript management. This might be able to be used for re\nmote code execution. No publicly available exploits are known.\n\nSolution:\nDisable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8994\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-33605\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nmanagesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a \nsmall malformed command before authenticating.\n\nRisk:\nIf running in high-security mode (default for community releases), only the attacker\u0027s own connection is terminated. If \nrunning in high-performance mode (default for Pro \nreleases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause \ndenial of service for Sieve script management. No \npublicly available exploits are known.\n\nSolution:\nRestrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-9039\nType: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: tipsennn@yeswehack\nCVE: CVE-2026-40018\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nMySQL multi-byte escaping wrong. None\n\nRisk:\nNone No publicly available exploits are known.\n\nSolution:\nNone\n\n\n\n---\n\n\n\nInternal reference: DOV-9041\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot CE core \u003e=2.4.3 \u003c2.4.5\nFirst fixed revision: OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-4"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1050",
"description": "CWE-1050",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-124",
"description": "CWE-124",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-125",
"description": "CWE-125",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-200",
"description": "CWE-200",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-284",
"description": "CWE-284",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-287",
"description": "CWE-287",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-400",
"description": "CWE-400",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-403",
"description": "CWE-403",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-416",
"description": "CWE-416",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-655",
"description": "CWE-655",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-674",
"description": "CWE-674",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-89",
"description": "CWE-89",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-93",
"description": "CWE-93",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-11T11:55:53Z",
"orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
"shortName": "VULNARCHIVE"
},
"references": [
{
"tags": [
"technical-description"
],
"url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/116"
},
{
"tags": [
"technical-description"
],
"url": "https://seclists.org/fulldisclosure/2026/Aug/116"
},
{
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html"
},
{
"url": "https://nmap.org/mailman/listinfo/fulldisclosure"
},
{
"url": "https://seclists.org/fulldisclosure/"
}
],
"source": {
"defect": [
"https://seclists.org/fulldisclosure/2026/Aug/116"
],
"discovery": "EXTERNAL"
},
"title": "Dovecot Security Advisory 3/2026",
"x_gcve": [
{
"recordType": "reference",
"relationships": [
{
"destId": "CVE-2023-51764",
"type": "related"
},
{
"destId": "CVE-2023-51766",
"type": "related"
},
{
"destId": "CVE-2026-27852",
"type": "related"
},
{
"destId": "CVE-2026-33263",
"type": "related"
},
{
"destId": "CVE-2026-33604",
"type": "related"
},
{
"destId": "CVE-2026-33605",
"type": "related"
},
{
"destId": "CVE-2026-33606",
"type": "related"
},
{
"destId": "CVE-2026-33607",
"type": "related"
},
{
"destId": "CVE-2026-40013",
"type": "related"
},
{
"destId": "CVE-2026-40014",
"type": "related"
},
{
"destId": "CVE-2026-40015",
"type": "related"
},
{
"destId": "CVE-2026-40017",
"type": "related"
},
{
"destId": "CVE-2026-40018",
"type": "related"
},
{
"destId": "CVE-2026-40019",
"type": "related"
},
{
"destId": "CVE-2026-40203",
"type": "related"
},
{
"destId": "CVE-2026-40204",
"type": "related"
},
{
"destId": "CVE-2026-40205",
"type": "related"
},
{
"destId": "CVE-2026-42007",
"type": "related"
},
{
"destId": "CVE-2026-42008",
"type": "related"
},
{
"destId": "CVE-2026-42391",
"type": "related"
},
{
"destId": "CVE-2026-42392",
"type": "related"
},
{
"destId": "CVE-2026-42393",
"type": "related"
},
{
"destId": "CVE-2026-42395",
"type": "related"
},
{
"destId": "CVE-2026-52681",
"type": "related"
},
{
"destId": "CVE-2026-52687",
"type": "related"
},
{
"destId": "CVE-2026-73208",
"type": "related"
},
{
"destId": "CVE-2026-73209",
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GCVE-1988-2026-0253
Vulnerability from gna-1988 – Published: 2026-09-08 08:13 – Updated: 2026-09-11 11:23
VLAI
EPSS
VEX
Title
Dovecot Security Advisory OXDC-2026-0002
Summary
Hi!
We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those
vulnerabilities. This advisory is also published at
https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0002.html
---
Classification: TLP:GREEN
Internal reference: DOV-8967
Type: CWE-235 (Improper Handling of Extra Parameters)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.4, OX Dovecot CE core 2.4.3
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-03-29
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: caprinuxx@yeswehack
CVE: CVE-2026-27851
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
lib-var-expand: Safe filter leaks to all following pipelines. When safe filter is used with variable expansion, all
following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped.
Risk:
This can enable SQL / LDAP injection attacks when used in authentication. No publicly available exploits are known.
Solution:
Avoid using safe filter until on fixed version.
---
Internal reference: DOV-8948
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-03-24
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: djvirus@yeswehack
CVE: CVE-2026-40016
CVSS: 5.3 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
Details:
Sieve :contains/:matches O(N×M) Substring Match Bypasses sieve_max_cpu_time Limit (130× Overrun). Attacker can upload a
malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130
times of the configured limit.
Risk:
Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. No
publicly available exploits are known.
Solution:
Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access.
---
Internal reference: DOV-9030
Type: CWE-99 (Improper Control of Resource Identifiers ('Resource Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-08
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: ylwango613@yeswehack
CVE: CVE-2026-33603
CVSS: 6.8 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
login: Base64 input can contain tabs that bypass IPC protection. Attacker can use a specially crafted base64 exchange
between Dovecot and Client to fake SCRAM TLS channel binding. This requires that the attacker is able to position
itself between Dovecot and the client connection.
Risk:
If successful, the attacker can eavesdrop communications between Dovecot and client as MITM proxy. No publicly
available exploits are known.
Solution:
Install fixed version.
---
Internal reference: DOV-9040
Type: CWE-284 (Improper Access Control)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-08
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: ilhamaf@yeswehack
CVE: CVE-2026-40020
CVSS: 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
IMAP folders can be shared-spammed to everyone. Attacker can use the IMAP SETACL command to inject the anyone
permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users.
Risk:
The impact is limited to being able to spam folders to other users, no unexpected access is gained. No publicly
available exploits are known.
Solution:
Install to fixed version.
---
Internal reference: DOV-9138
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.0.5, OX Dovecot Pro core 3.1.4, OX Dovecot CE core 2.4.3
First fixed revision: OX Dovecot Pro core 3.1.5, OX Dovecot CE core 2.4.4
Discovery date: 2026-04-27
Solution date: 2026-05-05
Disclosure date: 2026-05-05
Researcher credits: D4RKCYPH3R@yeswehack
CVE: CVE-2026-42006
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
imap-login: Excessive memory usage DoS - Try 2. An attacker can cause uncontrolled memory usage with excessive bracing
over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another
way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit.
Risk:
Using excessive bracing, attacker can cause memory usage up to configured memory limit. No publicly available exploits
are known.
Solution:
Install fixed version, or configure vsz_limit for imap process to low value.
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dovecot | Security Advisory |
Affected:
unknown
|
Relationships
reference
GCVE-1988-2026-0253 (this record)
- related CVE-2026-27851
- related CVE-2026-27857
- related CVE-2026-33603
- related CVE-2026-40016
- related CVE-2026-40020
- related CVE-2026-42006
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GCVE-1988-2026-0235
Vulnerability from gna-1988 – Published: 2026-09-08 08:13 – Updated: 2026-09-11 11:15
VLAI
EPSS
VEX
Title
Dovecot Security Advisory OXDC-2026-0001
Summary
Dear subscribers,
we're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those
vulnerabilities. This advisory is also published at
https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0001.html
---
Classification: TLP:GREEN
Internal reference: DOV-7830
Type: CWE-1250 (Improper Preservation of Consistency Between Independent Representations of Shared State)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot CE core 2.4.1
Discovery date: 2025-07-24
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: Erik <erik () broadlux com>
CVE: CVE-2025-30189
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
v2.4 regression: auth cache broken with several passdb / userdb. When cache is enabled, some passdb/userdb drivers
incorrectly cache all users with same cache key, causing wrong cached information to be used for these users.
Risk:
After cached login, all subsequent logins are for same user. No publicly available exploits are known.
Solution:
Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers.
---
Internal reference: DOV-8349
Type: CWE-20 (Improper Input Validation)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot Pro core 3.1.2, OX Dovecot CE core 2.4.3
Discovery date: 2025-11-04
Solution date: 2026-03-27
Disclosure date: 2026-03-27
CVE: CVE-2025-59028
CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Details:
Invalid base64 authentication can cause DoS for other logins. When sending invalid base64 SASL data, login process is
disconnected from the auth server, causing all active authentication sessions to fail.
Risk:
Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. No publicly available exploits
are known.
Solution:
Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments).
---
Internal reference: DOV-8508
Type: CWE-20 (Improper Input Validation)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3
Discovery date: 2025-11-29
Solution date: 2026-03-27
Disclosure date: 2026-03-27
CVE: CVE-2025-59032
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
v2.4/v3.1 regression: Pigeonhole: ManageSieve panic occurs with sieve-connect as a client. ManageSieve AUTHENTICATE
command crashes when using literal as SASL initial response.
Risk:
This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. No publicly available
exploits are known.
Solution:
Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version.
---
Internal reference: DOV-8584
Type: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3, OX Dovecot Pro core 2.3.22.1
Discovery date: 2025-12-29
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: cavid@yeswehack
CVE: CVE-2025-59031
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
Details:
decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing. Dovecot has provided a
script to use for attachment to text conversion. This script unsafely handles zip-style attachments.
Risk:
Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and
subsequently ending up in FTS indexes. No publicly available exploits are known.
Solution:
Do not use the provided script, instead, use something else like FTS tika.
---
Internal reference: DOV-8591
Type: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
Discovery date: 2026-01-07
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: strokep@yeswehack
CVE: CVE-2026-0394
CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Details:
auth: Path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`Pre-auth
path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`. When dovecot
has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has
been added to allowed characters, path traversal can happen if the domain component is directory partial.
Risk:
This allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains
passwords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear
valid users. No publicly available exploits are known.
Solution:
Upgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can
also ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d.
---
Internal reference: DOV-8775
Type: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4
Discovery date: 2026-02-20
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: cookiejack15@yeswehack
CVE: CVE-2026-27860
CVSS: 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)
Details:
v2.4/v3.1 regression: auth-ldap is not escaping usernames. If auth_username_chars is empty, it is possible to inject
arbitrary LDAP filter to Dovecot's LDAP authentication.
Risk:
This leads to potentially bypassing restrictions and allows probing of LDAP structure. No publicly available exploits
are known.
Solution:
Do not clear out auth_username_chars, or install fixed version.
---
Internal reference: DOV-8781
Type: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4
Discovery date: 2026-02-23
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: whisperer@yeswehack
CVE: CVE-2026-24031
CVSS: 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L)
Details:
v2.4/v3.1 regression: SQL injection allows bypassing authentication. Dovecot SQL based authentication can be bypassed
when auth_username_chars is cleared by admin.
Risk:
This vulnerability allows bypassing authentication for any user and user enumeration. No publicly available exploits
are known.
Solution:
Do not clear auth_username_chars. If this is not possible, install latest fixed version.
---
Internal reference: DOV-8787
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 3.0.2, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4
Discovery date: 2026-02-24
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: djvirus@yeswehack
CVE: CVE-2026-27859
CVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Details:
v3.0.2+ regression: Message headers MIME parameter parsing can cause excessive CPU usage. A mail message containing
excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.
Risk:
A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. No publicly
available exploits are known.
Solution:
Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the
processing is limited.
---
Internal reference: DOV-8816
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro
core 2.3.22.1
Discovery date: 2026-02-27
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: whisperer@yeswehack
CVE: CVE-2026-27857
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
imap-login: Excessive memory usage DoS. Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in
~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for
longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and
create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the
process and its other proxied connections.
Risk:
Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which
would likely result in reaching VSZ limit and killing the process and its other proxied connections. No publicly
available exploits are known.
Solution:
Install fixed version, there is no other remediation.
---
Internal reference: DOV-8818
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0
First fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro
core 2.3.22.1
Discovery date: 2026-02-28
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-27858
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
managesieve-login out-of-memory DoS. Attacker can send a specifically crafted message before authentication that causes
managesieve to allocate large amount of memory.
Risk:
Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. No publicly available
exploits are known.
Solution:
Protect access to managesieve protocol, or install fixed version.
---
Internal reference: DOV-8830
Type: CWE-287 (Improper Authentication)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Last affected revision: OX Dovecot Pro core 2.3.0
First fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro
core 2.3.22.1
Discovery date: 2026-03-04
Solution date: 2026-03-27
Disclosure date: 2026-03-27
Researcher credits: bksparajuli@yeswehack
CVE: CVE-2026-27856
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
doveadm: Credentials verified without timing safety. Doveadm credentials are verified using direct comparison which is
susceptible to timing oracle attack. An attacker can use this to determine the configured credentials.
Risk:
Figuring out the credential will le
Severity
No CVSS data available.
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dovecot | Security Advisory |
Affected:
unknown
|
Relationships
reference
GCVE-1988-2026-0235 (this record)
- related CVE-2025-30189
- related CVE-2025-59028
- related CVE-2025-59031
- related CVE-2025-59032
- related CVE-2026-0394
- related CVE-2026-24031
- related CVE-2026-27855
- related CVE-2026-27856
- related CVE-2026-27857
- related CVE-2026-27858
- related CVE-2026-27859
- related CVE-2026-27860
{
"containers": {
"cna": {
"affected": [
{
"product": "Security Advisory",
"vendor": "Dovecot",
"versions": [
{
"status": "affected",
"version": "unknown"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Aki Tuomi"
}
],
"descriptions": [
{
"lang": "en",
"value": "Dear subscribers,\n\nwe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory is also published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0001.html\n\n\n---\n\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-7830\nType: CWE-1250 (Improper Preservation of Consistency Between Independent Representations of Shared State)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.1\nDiscovery date: 2025-07-24\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: Erik \u003cerik () broadlux com\u003e\nCVE: CVE-2025-30189\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nv2.4 regression: auth cache broken with several passdb / userdb. When cache is enabled, some passdb/userdb drivers \nincorrectly cache all users with same cache key, causing wrong cached information to be used for these users.\n\nRisk:\nAfter cached login, all subsequent logins are for same user. No publicly available exploits are known.\n\nSolution:\nInstall fixed version or disable caching either globally or for the impacted passdb/userdb drivers.\n\n\n\n---\n\n\n\nInternal reference: DOV-8349\nType: CWE-20 (Improper Input Validation)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.1.2, OX Dovecot CE core 2.4.3\nDiscovery date: 2025-11-04\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nCVE: CVE-2025-59028\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nInvalid base64 authentication can cause DoS for other logins. When sending invalid base64 SASL data, login process is \ndisconnected from the auth server, causing all active authentication sessions to fail.\n\nRisk:\nInvalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. No publicly available exploits \nare known.\n\nSolution:\nInstall fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments).\n\n\n\n---\n\n\n\nInternal reference: DOV-8508\nType: CWE-20 (Improper Input Validation)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3\nDiscovery date: 2025-11-29\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nCVE: CVE-2025-59032\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nv2.4/v3.1 regression: Pigeonhole: ManageSieve panic occurs with sieve-connect as a client. ManageSieve AUTHENTICATE \ncommand crashes when using literal as SASL initial response.\n\nRisk:\nThis can be used to crash ManageSieve service repeatedly, making it unavailable for other users. No publicly available \nexploits are known.\n\nSolution:\nControl access to ManageSieve port, or disable the service if it\u0027s not needed. Alternatively upgrade to a fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8584\nType: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.3, OX Dovecot Pro core 2.3.22.1\nDiscovery date: 2025-12-29\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: cavid@yeswehack\nCVE: CVE-2025-59031\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\ndecode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing. Dovecot has provided a \nscript to use for attachment to text conversion. This script unsafely handles zip-style attachments.\n\nRisk:\nAttacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and \nsubsequently ending up in FTS indexes. No publicly available exploits are known.\n\nSolution:\nDo not use the provided script, instead, use something else like FTS tika.\n\n\n\n---\n\n\n\nInternal reference: DOV-8591\nType: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nDiscovery date: 2026-01-07\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: strokep@yeswehack\nCVE: CVE-2026-0394\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\nauth: Path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`Pre-auth \npath traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`. When dovecot \nhas been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has \nbeen added to allowed characters, path traversal can happen if the domain component is directory partial.\n\nRisk:\nThis allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains \npasswords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear \nvalid users. No publicly available exploits are known.\n\nSolution:\nUpgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can \nalso ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d.\n\n\n\n---\n\n\n\nInternal reference: DOV-8775\nType: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query (\u0027LDAP Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-20\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: cookiejack15@yeswehack\nCVE: CVE-2026-27860\nCVSS: 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)\n\nDetails:\nv2.4/v3.1 regression: auth-ldap is not escaping usernames. If auth_username_chars is empty, it is possible to inject \narbitrary LDAP filter to Dovecot\u0027s LDAP authentication.\n\nRisk:\nThis leads to potentially bypassing restrictions and allows probing of LDAP structure. No publicly available exploits \nare known.\n\nSolution:\nDo not clear out auth_username_chars, or install fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8781\nType: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-23\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: whisperer@yeswehack\nCVE: CVE-2026-24031\nCVSS: 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L)\n\nDetails:\nv2.4/v3.1 regression: SQL injection allows bypassing authentication. Dovecot SQL based authentication can be bypassed \nwhen auth_username_chars is cleared by admin.\n\nRisk:\nThis vulnerability allows bypassing authentication for any user and user enumeration. No publicly available exploits \nare known.\n\nSolution:\nDo not clear auth_username_chars. If this is not possible, install latest fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8787\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 3.0.2, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4\nDiscovery date: 2026-02-24\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-27859\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nv3.0.2+ regression: Message headers MIME parameter parsing can cause excessive CPU usage. A mail message containing \nexcessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.\n\nRisk:\nA suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. No publicly \navailable exploits are known.\n\nSolution:\nUse MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the \nprocessing is limited.\n\n\n\n---\n\n\n\nInternal reference: DOV-8816\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-02-27\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: whisperer@yeswehack\nCVE: CVE-2026-27857\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nimap-login: Excessive memory usage DoS. Sending \"NOOP (((...)))\" command with 4000 parenthesis open+close results in \n~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for \nlonger time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and \ncreate 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the \nprocess and its other proxied connections.\n\nRisk:\nAttacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which \nwould likely result in reaching VSZ limit and killing the process and its other proxied connections. No publicly \navailable exploits are known.\n\nSolution:\nInstall fixed version, there is no other remediation.\n\n\n\n---\n\n\n\nInternal reference: DOV-8818\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0, OX Dovecot Pro core 3.1.0, OX Dovecot CE core 2.4.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-02-28\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-27858\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nmanagesieve-login out-of-memory DoS. Attacker can send a specifically crafted message before authentication that causes \nmanagesieve to allocate large amount of memory.\n\n\nRisk:\nAttacker can force managesieve-login to be unavailable by repeatedly crashing the process. No publicly available \nexploits are known.\n\nSolution:\nProtect access to managesieve protocol, or install fixed version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8830\nType: CWE-287 (Improper Authentication)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nLast affected revision: OX Dovecot Pro core 2.3.0\nFirst fixed revision: OX Dovecot Pro core 3.0.5, OX Dovecot CE core 2.4.3, OX Dovecot Pro core 3.1.4, OX Dovecot Pro \ncore 2.3.22.1\nDiscovery date: 2026-03-04\nSolution date: 2026-03-27\nDisclosure date: 2026-03-27\nResearcher credits: bksparajuli@yeswehack\nCVE: CVE-2026-27856\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\ndoveadm: Credentials verified without timing safety. Doveadm credentials are verified using direct comparison which is \nsusceptible to timing oracle attack. An attacker can use this to determine the configured credentials.\n\nRisk:\nFiguring out the credential will le"
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GCVE-1988-2026-0155
Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-11 08:13
VLAI
EPSS
VEX
Title
[NotCVE-2026-0011] Nmap 7.99 and Earlier nselib/packet.lua Zero-Length TCP Option Infinite Loop Allows Remote Denial of Service
Summary
----------------------------------------------------------------------------
NotCVE Advisory — NotCVE-2026-0011
----------------------------------------------------------------------------
[-] Summary:
Nmap 7.99 and earlier contain a loop with an unreachable exit condition in
the Packet:parse_options() method of nselib/packet.lua. A remote host that
is the target of a scan can exhaust the memory of the scanning Nmap process
and terminate it by replying with a packet that carries a zero-length header
option. No authentication and no access to the scanning machine are
required: the attacker only needs to be scanned.
CVSS:3.1 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
[-] Affected:
Nmap, versions 7.99 and earlier (nselib/packet.lua).
Fixed in commit 7ef4ee0 (2026-06-11). That fix sits above the topmost
release header in the CHANGELOG (Nmap 7.99 [2026-03-26]), so as of this
writing it is present only in the development tree and no released version
carrying it has been verified.
[-] Technical Description:
Packet:parse_options(offset, length) walks the option area with a cursor,
opt_ptr, reading an option type t and, for any type other than 0 (End of
Option List) or 1 (No-Operation), a length byte l taken from
self:u8(offset + opt_ptr + 1). The cursor is then advanced by
opt_ptr = opt_ptr + l.
Before commit 7ef4ee0 the parser accepted l == 0 without validation, so the
cursor never advanced and the "while opt_ptr < length" condition never
became false. Because the loop body allocated a fresh table with
options[op] = {} and incremented op on every pass, the non-terminating loop
also grew a table without bound, and the Lua interpreter embedded in Nmap
consumed memory until the process died. The options[op] = {} assignment was
positioned before the length was validated, which is why the loop allocated
rather than merely spinning.
The method is reached from tcp_parse(), where the option area length derives
from the TCP data offset field of the received packet. A remote peer
therefore controls both the length of the option area and its contents.
nselib/packet.lua is the packet-dissection library used by NSE scripts that
capture and parse raw packets, so exploitation requires the operator to run
a scan that loads such a script against a host the attacker controls.
Nothing is persisted and the effect ends with the process, but the attacker
can repeat it on every subsequent scan, so the host remains effectively
unscannable by any script using this library.
Commit 7ef4ee0 ("Stop parsing on a zero-length packet option") adds an
"if l==0 then break end" guard before any allocation and moves the
options[op] = {} initialisation to after that check. The CHANGELOG entry
reads "[NSE][GH#3368] Fixed an out-of-memory issue in packet.lua when
parsing a zero-length TCP header option."
The step-by-step attack path, the reachability analysis of the IP options
code path and the full write-up are published at the advisory URL below.
Weaknesses:
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC-130: Excessive Allocation
[-] Timeline:
[28/07/2026] - NotCVE ID reserved.
[28/07/2026] - Published as NotCVE-2026-0011.
[-] Credit:
Discovered by Maxim Suhanov (@errno_fail).
[-] Full Details and Updates:
https://notcve.org/notcve/NotCVE-2026-0011
[-] References:
https://github.com/nmap/nmap/issues/3368
https://github.com/nmap/nmap/commit/7ef4ee030a0023fe22616387a000032e1a678b6a
https://github.com/nmap/nmap/pull/3373
https://raw.githubusercontent.com/nmap/nmap/master/nselib/packet.lua
https://raw.githubusercontent.com/nmap/nmap/master/CHANGELOG
[-] About NotCVE:
NotCVE (https://notcve.org) assigns public, timestamped NotCVE IDs to
vulnerabilities not acknowledged by vendors. Vendor will not assign a CVE?
Request a NotCVE: https://notcve.org/form/ · Contributors:
https://notcve.org/hall/
_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
References
13 references
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GCVE-1-2026-0034 (CVE-2026-9137)
Vulnerability from gna-1 – Published: 2026-05-20 18:15 – Updated: 2026-05-20 18:42
VLAI
EPSS
VEX
Title
CSP Report Endpoint Log Flooding via Incorrect Size Limit
Summary
The CSP report endpoint intended to limit logged CSP reports to 1 KB but incorrectly allowed reports up to 1 MB before truncation. On deployments where the endpoint is reachable by untrusted clients, this could allow attackers to generate excessive log volume and contribute to resource exhaustion or log flooding.
Severity
CWE
- CWE-400 - Uncontrolled Resource Consumption
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/02932cccab230… | patch |
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GCVE-1988-2026-0020
Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-11 11:55
VLAI
EPSS
VEX
Title
Dovecot Security Advisory 3/2026
Summary
Hi!
We're sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those
vulnerabilities. This advisory will also be published at
https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html
---
Classification: TLP:GREEN
Internal reference: DOV-8476
Type: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2025-11-25
Solution date: 2026-08-26
Disclosure date: 2026-08-26
CVE: CVE-2026-33263
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
submission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file
descriptor. When mail_max_userip_connections is set (defaul
t 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.
Risk:
If running in high-security mode (default for community releases), only the new submission connection gets terminated.
If running in high-performance mode (default for Pr
o releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure
for user to send a message, or it can cause duplica
te messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries
cannot happen, because the crash can only happen at AUT
H stage. No publicly available exploits are known.
Solution:
Limit the number of connections handled by single submission-login process. This has a performance impact though.
Update to non-vulnerable version.
---
Internal reference: DOV-8874
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <3.0.7, OX Dovecot Pro core >=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0
<2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5
Discovery date: 2026-03-11
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ylwango613@yeswehack
CVE: CVE-2026-33607
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
Dovecot IMAP LIST match_sub() Exponential Backtracking — CPU Denial of Service. An attacker that has valid credentials
can use IMAP LIST command to consume CPU.
Risk:
This can cause degradation or denial of service for IMAP. No publicly available exploits are known.
Solution:
Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed
version.
---
Internal reference: DOV-8884
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-13
Solution date: 2026-08-26
Disclosure date: 2026-08-26
CVE: CVE-2026-27852
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
DoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain
a very large number of email addresses or MIME par
ameters, which causes excessive memory usage when the message is later parsed.
Risk:
The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it,
causing denial of service for the affected user. No
publicly available exploits are known.
Solution:
Update to non-vulnerable version.
---
Internal reference: DOV-8941
Type: CWE-93 (Improper Neutralization of CRLF Sequences ('CRLF Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: thanos_haruki@yeswehack
CVE: CVE-2026-33606
CVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)
Details:
dsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is
interpreted as dsync protocol commands when an administ
rator later runs dsync with the stream protocol, for example during a migration.
Risk:
Injected commands can modify mailbox state on the destination during migration or replication, including internal
mailbox attributes that a user should not be able to set
directly. It can also cause dsync errors. No publicly available exploits are known.
Solution:
Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.
---
Internal reference: DOV-8947
Type: CWE-655 (Insufficient Psychological Acceptability)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: heckintosh@yeswehack
CVE: CVE-2026-33604
CVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
Details:
SMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a
message, for example through Sieve redirect or submission
relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message
content from being interpreted as SMTP commands.
Risk:
A downstream mail server that hasn't yet fixed the SMTP smuggling vulnerability can be tricked into treating part of
the message body as new SMTP commands, allowing injec
tion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available
exploits are known.
Solution:
Where you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to
non-vulnerable version.
---
Internal reference: DOV-8949
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-03-24
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: djvirus@yeswehack
CVE: CVE-2026-40014
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
Details:
IMAP THREAD REFERENCES O(N²) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send
mail to a user can craft a message header that makes
the IMAP THREAD command consume CPU disproportionate to the size of the message.
Risk:
When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for
IMAP. No publicly available exploits are known.
Solution:
Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected
mailbox. Update to non-vulnerable version.
---
Internal reference: DOV-8991
Type: CWE-124 (Buffer Underwrite ('Buffer Underflow'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-04-02
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-40013
CVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)
Details:
pigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid
credentials can submit a Sieve script containing an extreme
numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.
Risk:
This causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for
script management. This might be able to be used for re
mote code execution. No publicly available exploits are known.
Solution:
Disable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.
---
Internal reference: DOV-8994
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <2.3.22.2, OX Dovecot Pro core >=3.0.0 <3.0.7, OX Dovecot Pro core
=3.1.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE
core 2.4.5
Discovery date: 2026-04-02
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-33605
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Details:
managesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a
small malformed command before authenticating.
Risk:
If running in high-security mode (default for community releases), only the attacker's own connection is terminated. If
running in high-performance mode (default for Pro
releases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause
denial of service for Sieve script management. No
publicly available exploits are known.
Solution:
Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.
---
Internal reference: DOV-9039
Type: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'))
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot Pro core >=2.3.0 <3.1.6, OX Dovecot CE core >=2.3.0 <2.4.5
First fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5
Discovery date: 2026-04-08
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: tipsennn@yeswehack
CVE: CVE-2026-40018
CVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Details:
MySQL multi-byte escaping wrong. None
Risk:
None No publicly available exploits are known.
Solution:
None
---
Internal reference: DOV-9041
Type: CWE-400 (Uncontrolled Resource Consumption)
Component: core
Report confidence: Confirmed
Solution status: Fixed by vendor
Affected versions: OX Dovecot CE core >=2.4.3 <2.4.5
First fixed revision: OX Dovecot CE core 2.4.5
Discovery date: 2026-04-08
Solution date: 2026-08-26
Disclosure date: 2026-08-26
Researcher credits: ilyar@yeswehack
CVE: CVE-2026-4
Severity
No CVSS data available.
CWE
Assigner
References
5 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Dovecot | Security Advisory |
Affected:
unknown
|
{
"containers": {
"cna": {
"affected": [
{
"product": "Security Advisory",
"vendor": "Dovecot",
"versions": [
{
"status": "affected",
"version": "unknown"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Aki Tuomi"
}
],
"descriptions": [
{
"lang": "en",
"value": "Hi!\n\nWe\u0027re sharing our latest advisory with you and like to thank everyone who contributed in finding and solving those \nvulnerabilities. This advisory will also be published at \nhttps://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html\n\n---\n\nClassification: TLP:GREEN\n\nInternal reference: DOV-8476\nType: CWE-403 (Exposure of File Descriptor to Unintended Control Sphere (\u0027File Descriptor Leak\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2025-11-25\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-33263\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nsubmission-login: Panic when mail_max_userip_connections is reached: Panic: epoll_ctl(del, 8) failed: Bad file \ndescriptor. When mail_max_userip_connections is set (defaul\nt 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues.\n\nRisk:\nIf running in high-security mode (default for community releases), only the new submission connection gets terminated. \nIf running in high-performance mode (default for Pr\no releases), all connections handled by the submission-login process will be terminated. The crashes can cause failure \nfor user to send a message, or it can cause duplica\nte messages to be sent. If TLS is not used (in the backend server processing the submission), duplicate deliveries \ncannot happen, because the crash can only happen at AUT\nH stage. No publicly available exploits are known.\n\nSolution:\nLimit the number of connections handled by single submission-login process. This has a performance impact though. \nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8874\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.0.7, OX Dovecot Pro core \u003e=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \n\u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-03-11\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ylwango613@yeswehack\nCVE: CVE-2026-33607\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\nDovecot IMAP LIST match_sub() Exponential Backtracking \u2014 CPU Denial of Service. An attacker that has valid credentials \ncan use IMAP LIST command to consume CPU.\n\nRisk:\nThis can cause degradation or denial of service for IMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed \nversion.\n\n\n\n---\n\n\n\nInternal reference: DOV-8884\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-13\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nCVE: CVE-2026-27852\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nDoS by sending mail with bad header. An attacker that can send mail to a user can craft a message whose headers contain \na very large number of email addresses or MIME par\nameters, which causes excessive memory usage when the message is later parsed.\n\nRisk:\nThe message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, \ncausing denial of service for the affected user. No\n publicly available exploits are known.\n\nSolution:\nUpdate to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8941\nType: CWE-93 (Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: thanos_haruki@yeswehack\nCVE: CVE-2026-33606\nCVSS: 4.8 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N)\n\nDetails:\ndsync: Mail content can cause dsync protocol injection. Mail content stored by a user can be crafted so that it is \ninterpreted as dsync protocol commands when an administ\nrator later runs dsync with the stream protocol, for example during a migration.\n\nRisk:\nInjected commands can modify mailbox state on the destination during migration or replication, including internal \nmailbox attributes that a user should not be able to set\n directly. It can also cause dsync errors. No publicly available exploits are known.\n\nSolution:\nAvoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8947\nType: CWE-655 (Insufficient Psychological Acceptability)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: heckintosh@yeswehack\nCVE: CVE-2026-33604\nCVSS: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)\n\nDetails:\nSMTP Smuggling via Missing Dot-Stuffing After Bare Carriage Return. An attacker that can get Dovecot to relay a \nmessage, for example through Sieve redirect or submission \nrelay, can use a crafted line ending in the message body to bypass the outbound protection that prevents message \ncontent from being interpreted as SMTP commands.\n\nRisk:\nA downstream mail server that hasn\u0027t yet fixed the SMTP smuggling vulnerability can be tricked into treating part of \nthe message body as new SMTP commands, allowing injec\ntion of spoofed email. This is the same vulnerability class as CVE-2023-51764 and CVE-2023-51766. No publicly available \nexploits are known.\n\nSolution:\nWhere you control the receiving mail servers, ensure they reject bare carriage returns in message data. Update to \nnon-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8949\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-03-24\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: djvirus@yeswehack\nCVE: CVE-2026-40014\nCVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)\n\nDetails:\nIMAP THREAD REFERENCES O(N\u00b2) CPU DoS via Crafted References Header (index-thread-links.c). An attacker that can send \nmail to a user can craft a message header that makes \nthe IMAP THREAD command consume CPU disproportionate to the size of the message.\n\nRisk:\nWhen a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for \nIMAP. No publicly available exploits are known.\n\nSolution:\nMonitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected \nmailbox. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8991\nType: CWE-124 (Buffer Underwrite (\u0027Buffer Underflow\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-40013\nCVSS: 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)\n\nDetails:\npigeonhole: Stack Buffer Underflow in Pigeonhole ManageSieve CHECKSCRIPT/PUTSCRIPT. An attacker that has valid \ncredentials can submit a Sieve script containing an extreme\n numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles the script.\n\nRisk:\nThis causes memory corruption and an observed crash of the ManageSieve process, resulting in denial of service for \nscript management. This might be able to be used for re\nmote code execution. No publicly available exploits are known.\n\nSolution:\nDisable the ManageSieve service if users do not need remote Sieve script management. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-8994\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c2.3.22.2, OX Dovecot Pro core \u003e=3.0.0 \u003c3.0.7, OX Dovecot Pro core \n=3.1.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.0.7, OX Dovecot Pro core 2.3.22.2, OX Dovecot Pro core 3.1.6, OX Dovecot CE \ncore 2.4.5\nDiscovery date: 2026-04-02\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-33605\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nDetails:\nmanagesieve-login: Pre-auth crash. An unauthenticated attacker can crash the ManageSieve login process by sending a \nsmall malformed command before authenticating.\n\nRisk:\nIf running in high-security mode (default for community releases), only the attacker\u0027s own connection is terminated. If \nrunning in high-performance mode (default for Pro \nreleases), all connections handled by the same managesieve-login process are terminated. Repeating the attack can cause \ndenial of service for Sieve script management. No \npublicly available exploits are known.\n\nSolution:\nRestrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version.\n\n\n\n---\n\n\n\nInternal reference: DOV-9039\nType: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027))\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot Pro core \u003e=2.3.0 \u003c3.1.6, OX Dovecot CE core \u003e=2.3.0 \u003c2.4.5\nFirst fixed revision: OX Dovecot Pro core 3.1.6, OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: tipsennn@yeswehack\nCVE: CVE-2026-40018\nCVSS: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)\n\nDetails:\nMySQL multi-byte escaping wrong. None\n\nRisk:\nNone No publicly available exploits are known.\n\nSolution:\nNone\n\n\n\n---\n\n\n\nInternal reference: DOV-9041\nType: CWE-400 (Uncontrolled Resource Consumption)\nComponent: core\nReport confidence: Confirmed\nSolution status: Fixed by vendor\nAffected versions: OX Dovecot CE core \u003e=2.4.3 \u003c2.4.5\nFirst fixed revision: OX Dovecot CE core 2.4.5\nDiscovery date: 2026-04-08\nSolution date: 2026-08-26\nDisclosure date: 2026-08-26\nResearcher credits: ilyar@yeswehack\nCVE: CVE-2026-4"
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]
}
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"discovery": "EXTERNAL"
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"title": "Dovecot Security Advisory 3/2026",
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Mitigation
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place. The login application should be protected against DoS attacks as much as possible. Limiting the database access, perhaps by caching result sets, can help minimize the resources expended. To further limit the potential for a DoS attack, consider tracking the rate of requests received from users and blocking requests that exceed a defined rate threshold.
Mitigation
Architecture and Design
- Mitigation of resource exhaustion attacks requires that the target system either:
- The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
- The second solution is simply difficult to effectively institute -- and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.
- recognizes the attack and denies that user further access for a given amount of time, or
- uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Mitigation
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
Mitigation
Implementation
Ensure that all failures in resource allocation place the system into a safe posture.
CAPEC-147: XML Ping of the Death
An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
CAPEC-227: Sustained Client Engagement
An adversary attempts to deny legitimate users access to a resource by continually engaging a specific resource in an attempt to keep the resource tied up as long as possible. The adversary's primary goal is not to crash or flood the target, which would alert defenders; rather it is to repeatedly perform actions or abuse algorithmic flaws such that a given resource is tied up and not available to a legitimate user. By carefully crafting a requests that keep the resource engaged through what is seemingly benign requests, legitimate users are limited or completely denied access to the resource.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.