Common Weakness Enumeration

CWE-1333

Allowed

Inefficient Regular Expression Complexity

Abstraction: Base · Status: Draft

The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

724 vulnerabilities reference this CWE, most recent first.

CVE-2026-6850 (GCVE-0-2026-6850)

Vulnerability from cvelistv5 – Published: 2026-07-13 08:13 – Updated: 2026-07-13 13:56
VLAI
Title
Crafted message attachment causes client-side denial of service via markdown parser regex backtracking in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
URL Tags
https://mattermost.com/security-updates vendor-advisory
Impacted products
Vendor Product Version
Mattermost Mattermost Affected: 11.7.0 , ≤ 11.7.2 (semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver)
Affected: 10.11.0 , ≤ 10.11.19 (semver)
Unaffected: 11.8.0
Unaffected: 11.7.3
Unaffected: 11.6.5
Unaffected: 10.11.20
Create a notification for this product.
Credits
idr
Show details on NVD website

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CVE-2026-5986 (GCVE-0-2026-5986)

Vulnerability from cvelistv5 – Published: 2026-04-09 22:30 – Updated: 2026-04-14 03:12
VLAI
Title
Zod jsVideoUrlParser util.js getTime redos
Summary
A weakness has been identified in Zod jsVideoUrlParser up to 0.5.1. The impacted element is the function getTime in the library lib/util.js. This manipulation of the argument timestamp causes inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
  • CWE-400 - Resource Consumption
Assigner
References
URL Tags
https://vuldb.com/vuln/356540 vdb-entrytechnical-description
https://vuldb.com/vuln/356540/cti signaturepermissions-required
https://vuldb.com/submit/791911 third-party-advisory
https://github.com/Zod-/jsVideoUrlParser/issues/121 issue-tracking
https://github.com/Zod-/jsVideoUrlParser/issues/1… exploitissue-tracking
Impacted products
Vendor Product Version
Zod jsVideoUrlParser Affected: 0.5.0
Affected: 0.5.1
Create a notification for this product.
Credits
ybdesire (VulDB User) VulDB CNA Team
Show details on NVD website

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CVE-2026-4926 (GCVE-0-2026-4926)

Vulnerability from cvelistv5 – Published: 2026-03-26 18:59 – Updated: 2026-07-15 00:47
VLAI
Title
path-to-regexp vulnerable to Denial of Service via sequential optional groups
Summary
Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service. Patches: Fixed in version 8.4.0. Workarounds: Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
path-to-regexp path-to-regexp Affected: 8.0.0 , < 8.4.0 (semver)
Unaffected: 8.4.0 (semver)
Create a notification for this product.
Red Hat Cryostat 4 on RHEL 9 Unaffected: 4.2.0-9 , < * (rpm)
    cpe:/a:redhat:cryostat:4::el9
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 Unaffected: 0:2.5.20260422-3.el8ap , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.5::el8
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 Unaffected: 0:2.5.20260422-3.el9ap , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.5::el9
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 Unaffected: 0:2.6.9-1.el9ap , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
Create a notification for this product.
Red Hat Migration Toolkit for Virtualization 2.1 Unaffected: 1779139872 , < * (rpm)
    cpe:/a:redhat:migration_toolkit_virtualization:2.10::el9
Create a notification for this product.
Red Hat Migration Toolkit for Virtualization 2.9 Unaffected: 1778927462 , < * (rpm)
    cpe:/a:redhat:migration_toolkit_virtualization:2.9::el9
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777386606 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1779773804 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
Create a notification for this product.
Red Hat Red Hat Developer Hub 1.8 Unaffected: 1776784286 , < * (rpm)
    cpe:/a:redhat:rhdh:1.8::el9
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Red Hat Red Hat Developer Hub 1.9 Unaffected: 1777903262 , < * (rpm)
    cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat Edge Manager 1.0 Unaffected: 1783502765 , < * (rpm)
    cpe:/a:redhat:edge_manager:1.0::el9
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Red Hat Red Hat Edge Manager 1.0 Unaffected: 1783502438 , < * (rpm)
    cpe:/a:redhat:edge_manager:1.0::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.27 Unaffected: 1776744110 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.27 Unaffected: 1776795400 , < * (rpm)
    cpe:/a:redhat:openshift_devspaces:3.27::el9
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Red Hat Red Hat OpenShift distributed tracing 3.9.3 Unaffected: 1776435608 , < * (rpm)
    cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
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Red Hat Red Hat Trusted Artifact Signer 1.3 Unaffected: 1776673130 , < * (rpm)
Unaffected: 1776889929 , < * (rpm)
    cpe:/a:redhat:trusted_artifact_signer:1.3::el9
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
Create a notification for this product.
Red Hat Logging Subsystem for Red Hat OpenShift     cpe:/a:redhat:logging:5
Create a notification for this product.
Red Hat Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
Create a notification for this product.
Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
Create a notification for this product.
Red Hat Network Observability Operator     cpe:/a:redhat:network_observ_optr:1
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
Create a notification for this product.
Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
Create a notification for this product.
Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
Create a notification for this product.
Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
Create a notification for this product.
Red Hat Red Hat build of Apache Camel - HawtIO 4     cpe:/a:redhat:apache_camel_hawtio:4
Create a notification for this product.
Red Hat Red Hat build of Apicurio Registry 2     cpe:/a:redhat:service_registry:2
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Red Hat Red Hat Build of Podman Desktop     cpe:/a:redhat:podman_desktop:1
Create a notification for this product.
Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
Create a notification for this product.
Red Hat Red Hat Developer Hub     cpe:/a:redhat:rhdh:1
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat Openshift Data Foundation 4     cpe:/a:redhat:openshift_data_foundation:4
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Quay 3     cpe:/a:redhat:quay:3
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
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Red Hat Red Hat Trusted Profile Analyzer     cpe:/a:redhat:trusted_profile_analyzer:2
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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Credits
uug4na blakeembrey UlisesGascon
Show details on NVD website

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CVE-2026-4923 (GCVE-0-2026-4923)

Vulnerability from cvelistv5 – Published: 2026-03-26 19:02 – Updated: 2026-03-27 13:58
VLAI
Title
path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards
Summary
Impact: When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
path-to-regexp path-to-regexp Affected: 8.0.0 , < 8.4.0 (semver)
Unaffected: 8.4.0 (semver)
Create a notification for this product.
Credits
blakeembrey UlisesGascon
Show details on NVD website

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CVE-2026-4867 (GCVE-0-2026-4867)

Vulnerability from cvelistv5 – Published: 2026-03-26 16:16 – Updated: 2026-03-26 16:52
VLAI
Title
path-to-regexp vulnerable to Regular Expression Denial of Service via multiple route parameters
Summary
Impact: A bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking. Patches: Upgrade to path-to-regexp@0.1.13 Custom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group. Workarounds: All versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+). If paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
Impacted products
Vendor Product Version
path-to-regexp path-to-regexp Affected: 0 , < 0.1.13 (semver)
Create a notification for this product.
Credits
EthanKim88 blakeembrey UlisesGascon
Show details on NVD website

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CVE-2026-4539 (GCVE-0-2026-4539)

Vulnerability from cvelistv5 – Published: 2026-03-22 05:35 – Updated: 2026-03-23 16:08
VLAI
Title
pygments archetype.py AdlLexer redos
Summary
A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
  • CWE-400 - Resource Consumption
Assigner
References
URL Tags
https://vuldb.com/?id.352327 vdb-entrytechnical-description
https://vuldb.com/?ctiid.352327 signaturepermissions-required
https://vuldb.com/?submit.774685 third-party-advisory
https://github.com/pygments/pygments/issues/3058 exploitissue-tracking
https://github.com/pygments/pygments/ product
Impacted products
Vendor Product Version
n/a pygments Affected: 2.19.0
Affected: 2.19.1
Affected: 2.19.2
Credits
ybdesire (VulDB User)
Show details on NVD website

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CVE-2026-3293 (GCVE-0-2026-3293)

Vulnerability from cvelistv5 – Published: 2026-02-27 05:32 – Updated: 2026-02-27 18:53 X_Open Source
VLAI
Title
snowflakedb snowflake-jdbc JDBC URL SdkProxyRoutePlanner.java SdkProxyRoutePlanner redos
Summary
A weakness has been identified in snowflakedb snowflake-jdbc up to 4.0.1. Impacted is the function SdkProxyRoutePlanner of the file src/main/java/net/snowflake/client/internal/core/SdkProxyRoutePlanner.java of the component JDBC URL Handler. Executing a manipulation of the argument nonProxyHosts can lead to inefficient regular expression complexity. The attack can only be executed locally. The exploit has been made available to the public and could be used for attacks. This patch is called 5fb0a8a318a2ed87f4022a1f56e742424ba94052. A patch should be applied to remediate this issue.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
  • CWE-400 - Resource Consumption
Assigner
Impacted products
Vendor Product Version
snowflakedb snowflake-jdbc Affected: 4.0.0
Affected: 4.0.1
Create a notification for this product.
Credits
fushuling (VulDB User)
Show details on NVD website

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CVE-2026-1388 (GCVE-0-2026-1388)

Vulnerability from cvelistv5 – Published: 2026-02-25 20:05 – Updated: 2026-02-26 15:07
VLAI
Title
Inefficient Regular Expression Complexity in GitLab
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
URL Tags
https://gitlab.com/gitlab-org/gitlab/-/issues/587560 issue-trackingpermissions-required
https://hackerone.com/reports/3482893 technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/02/25/patc…
Impacted products
Vendor Product Version
GitLab GitLab Affected: 9.2 , < 18.7.5 (semver)
Affected: 18.8 , < 18.8.5 (semver)
Affected: 18.9 , < 18.9.1 (semver)
    cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program
Show details on NVD website

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CVE-2026-0967 (GCVE-0-2026-0967)

Vulnerability from cvelistv5 – Published: 2026-03-26 20:06 – Updated: 2026-05-19 13:17
VLAI
Title
Libssh: libssh: denial of service via inefficient regular expression processing
Summary
A flaw was found in libssh. A remote attacker, by controlling client configuration files or known_hosts files, could craft specific hostnames that when processed by the `match_pattern()` function can lead to inefficient regular expression backtracking. This can cause timeouts and resource exhaustion, resulting in a Denial of Service (DoS) for the client.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:0.12.0-2.el10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:0.10.4-18.el9 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
Create a notification for this product.
Date Public
2026-02-10 18:47
Credits
Red Hat would like to thank Jakub Jelen (libssh) and Kang Yang for reporting this issue.
Show details on NVD website

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CVE-2026-0668 (GCVE-0-2026-0668)

Vulnerability from cvelistv5 – Published: 2026-01-07 17:36 – Updated: 2026-01-07 19:17
VLAI
Title
VisualData extension: Regular Expression Denial of Service (ReDoS) via crafted user input
Summary
Inefficient Regular Expression Complexity vulnerability in Wikimedia Foundation MediaWiki - VisualData Extension allows Regular Expression Exponential Blowup.This issue affects MediaWiki - VisualData Extension: 1.45.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-1333 - Inefficient Regular Expression Complexity
Impacted products
Credits
Radman Siddiki
Show details on NVD website

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              "type": "CWE"
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        }
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        "dateUpdated": "2026-01-07T17:36:19.258Z",
        "orgId": "c4f26cc8-17ff-4c99-b5e2-38fc1793eacc",
        "shortName": "wikimedia-foundation"
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      "references": [
        {
          "url": "https://phabricator.wikimedia.org/T387008"
        },
        {
          "url": "https://gerrit.wikimedia.org/r/q/Ie08d9a8ceb2c9a22a635cfc27964353f14072dbf"
        },
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          "url": "https://gerrit.wikimedia.org/r/q/Ifbf9c2ade621226e14fe852f3217293772bf8bb8"
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          "url": "https://gerrit.wikimedia.org/r/q/I4ff2737c9f0ba805267d1fc8296e7cff61241ee3"
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      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "VisualData extension: Regular Expression Denial of Service (ReDoS) via crafted user input",
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  "cveMetadata": {
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    "assignerShortName": "wikimedia-foundation",
    "cveId": "CVE-2026-0668",
    "datePublished": "2026-01-07T17:36:19.258Z",
    "dateReserved": "2026-01-07T16:34:59.342Z",
    "dateUpdated": "2026-01-07T19:17:41.764Z",
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Mitigation
Architecture and Design

Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.

Mitigation
System Configuration

Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.

Mitigation
Implementation

Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.

Mitigation
Implementation

Limit the length of the input that the regular expression will process.

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.