Search
Find a vulnerability
Search criteria
ⓘ
Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.
6 vulnerabilities found for pyopenssl by pyopenssl
CVE-2026-27459 (GCVE-0-2026-27459)
Vulnerability from nvd – Published: 2026-03-17 23:34 – Updated: 2026-06-30 12:08
VLAI
Title
pyOpenSSL DTLS cookie callback buffer overflow
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
23 references
Impacted products
31 products
| Vendor | Product | Version | |
|---|---|---|---|
| pyca | pyopenssl |
Affected:
>= 22.0.0, < 26.0.0
|
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
cpe:/a:redhat:ansible_automation_platform:2.5::el8 cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8 cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8 |
|
| Red Hat | RHUI 4 for RHEL 8 |
cpe:/a:redhat:rhui:4::el8 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 |
cpe:/a:redhat:satellite:6.16::el8 cpe:/a:redhat:satellite_capsule:6.16::el8 cpe:/a:redhat:satellite_utils:6.16::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
cpe:/a:redhat:ansible_automation_platform:2.5::el9 cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9 cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
cpe:/a:redhat:ansible_automation_platform:2.6::el9 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9 cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 |
cpe:/a:redhat:satellite:6.16::el9 cpe:/a:redhat:satellite_capsule:6.16::el9 cpe:/a:redhat:satellite_utils:6.16::el9 |
|
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 |
cpe:/a:redhat:satellite:6.17::el9 cpe:/a:redhat:satellite_capsule:6.17::el9 cpe:/a:redhat:satellite_utils:6.17::el9 |
|
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 |
cpe:/a:redhat:satellite:6.18::el9 cpe:/a:redhat:satellite_capsule:6.18::el9 cpe:/a:redhat:satellite_maintenance:6.18::el9 cpe:/a:redhat:satellite_utils:6.18::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 |
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Quay 3.12 |
cpe:/a:redhat:quay:3.12::el8 |
|
| Red Hat | Red Hat Quay 3.14 |
cpe:/a:redhat:quay:3.14::el8 |
|
| Red Hat | Red Hat Quay 3.15 |
cpe:/a:redhat:quay:3.15::el8 |
|
| Red Hat | Red Hat Quay 3.16 |
cpe:/a:redhat:quay:3.16::el9 |
|
| Red Hat | Red Hat Quay 3.17 |
cpe:/a:redhat:quay:3.17::el9 |
|
| Red Hat | Red Hat Quay 3.1 |
cpe:/a:redhat:quay:3.10::el8 |
|
| Red Hat | Red Hat Quay 3.9 |
cpe:/a:redhat:quay:3.9::el8 |
|
| Red Hat | Red Hat Trusted Artifact Signer 1.4 |
cpe:/a:redhat:trusted_artifact_signer:1.4::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 |
cpe:/a:redhat:ansible_core:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 10 |
cpe:/a:redhat:ansible_automation_platform:2.6::el10 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10 |
|
| 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 OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
|
| Red Hat | Red Hat OpenStack Platform 17.1 |
cpe:/a:redhat:openstack:17.1 |
|
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0 |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27459",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-18T19:52:08.536876Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-18T19:52:15.812Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"affected": [
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el8",
"cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8",
"cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:rhui:4::el8"
],
"defaultStatus": "affected",
"product": "RHUI 4 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.16::el8",
"cpe:/a:redhat:satellite_capsule:6.16::el8",
"cpe:/a:redhat:satellite_utils:6.16::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.16 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el9",
"cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9",
"cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el9",
"cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9",
"cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.6 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.16::el9",
"cpe:/a:redhat:satellite_capsule:6.16::el9",
"cpe:/a:redhat:satellite_utils:6.16::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.16 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.17::el9",
"cpe:/a:redhat:satellite_capsule:6.17::el9",
"cpe:/a:redhat:satellite_utils:6.17::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.17 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.18::el9",
"cpe:/a:redhat:satellite_capsule:6.18::el9",
"cpe:/a:redhat:satellite_maintenance:6.18::el9",
"cpe:/a:redhat:satellite_utils:6.18::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.18 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "affected",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.12::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.12",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.14::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.14",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.15::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.15",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.16::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.16",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.17::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.17",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.10::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.1",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.9::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:trusted_artifact_signer:1.4::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Trusted Artifact Signer 1.4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_core:2"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform Ansible Core 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_ai"
],
"defaultStatus": "affected",
"product": "Red Hat OpenShift AI (RHOAI)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el10",
"cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10"
],
"defaultStatus": "unaffected",
"product": "Red Hat Ansible Automation Platform 2.6 for RHEL 10",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:7"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift:4"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openstack:17.1"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenStack Platform 17.1",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openstack:18.0"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenStack Platform 18.0",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6"
],
"defaultStatus": "unaffected",
"product": "Red Hat Satellite 6",
"vendor": "Red Hat"
}
],
"datePublic": "2026-03-17T23:34:28.483Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in pyOpenSSL. The set_cookie_generate_callback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a fixed-size buffer provided by the underlying OpenSSL library."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-30T12:08:07.873Z",
"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"shortName": "redhat-SADP"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-27459"
},
{
"name": "RHBZ#2448503",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448503"
},
{
"tags": [
"x_sadp-csaf-vex"
],
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13512"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:10754"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14874"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13508"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14873"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14835"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13553"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13545"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:7224"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11856"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:21017"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:24853"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:19375"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:22465"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11916"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11996"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:8437"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:13512: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:10754: RHUI 4 for RHEL 8"
},
{
"lang": "en",
"value": "RHSA-2026:14874: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:13508: Red Hat Ansible Automation Platform 2.6 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:14873: Red Hat Satellite 6.17 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:14835: Red Hat Satellite 6.18 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:13553: Red Hat Ansible Automation Platform 2.5"
},
{
"lang": "en",
"value": "RHSA-2026:13545: Red Hat Ansible Automation Platform 2.6"
},
{
"lang": "en",
"value": "RHSA-2026:7224: Red Hat Hardened Images"
},
{
"lang": "en",
"value": "RHSA-2026:11856: Red Hat Quay 3.12"
},
{
"lang": "en",
"value": "RHSA-2026:21017: Red Hat Quay 3.14"
},
{
"lang": "en",
"value": "RHSA-2026:24853: Red Hat Quay 3.15"
},
{
"lang": "en",
"value": "RHSA-2026:19375: Red Hat Quay 3.16"
},
{
"lang": "en",
"value": "RHSA-2026:22465: Red Hat Quay 3.17"
},
{
"lang": "en",
"value": "RHSA-2026:11916: Red Hat Quay 3.1"
},
{
"lang": "en",
"value": "RHSA-2026:11996: Red Hat Quay 3.9"
},
{
"lang": "en",
"value": "RHSA-2026:8437: Red Hat Trusted Artifact Signer 1.4"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-18T00:01:41.404Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-03-17T23:34:28.483Z",
"value": "Made public."
}
],
"title": "pyOpenSSL: DTLS cookie callback buffer overflow",
"workarounds": [
{
"lang": "en",
"value": "To mitigate this flaw, ensure the callback provided to the set_cookie_generate_callback function strictly limits the returned cookie string or byte sequence to under 256 bytes."
}
],
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"cna": {
"affected": [
{
"product": "pyopenssl",
"vendor": "pyca",
"versions": [
{
"status": "affected",
"version": "\u003e= 22.0.0, \u003c 26.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120: Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-17T23:34:28.483Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4"
},
{
"name": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408"
},
{
"name": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst"
}
],
"source": {
"advisory": "GHSA-5pwr-322w-8jr4",
"discovery": "UNKNOWN"
},
"title": "pyOpenSSL DTLS cookie callback buffer overflow"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27459",
"datePublished": "2026-03-17T23:34:28.483Z",
"dateReserved": "2026-02-19T17:25:31.100Z",
"dateUpdated": "2026-06-30T12:08:07.873Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-27448 (GCVE-0-2026-27448)
Vulnerability from nvd – Published: 2026-03-17 23:24 – Updated: 2026-03-18 20:18
VLAI
Title
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pyca/pyopenssl/security/adviso… | x_refsource_CONFIRM |
| https://github.com/pyca/pyopenssl/commit/d41a8147… | x_refsource_MISC |
| https://github.com/pyca/pyopenssl/blob/358cbf29c4… | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27448",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-18T20:17:52.492201Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-18T20:18:08.768Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "pyopenssl",
"vendor": "pyca",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.14.0, \u003c 26.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 1.7,
"baseSeverity": "LOW",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-636",
"description": "CWE-636: Not Failing Securely (\u0027Failing Open\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-17T23:24:30.661Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"name": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"name": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"source": {
"advisory": "GHSA-vp96-hxj8-p424",
"discovery": "UNKNOWN"
},
"title": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27448",
"datePublished": "2026-03-17T23:24:30.661Z",
"dateReserved": "2026-02-19T17:25:31.100Z",
"dateUpdated": "2026-03-18T20:18:08.768Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2018-1000807 (GCVE-0-2018-1000807)
Vulnerability from nvd – Published: 2018-10-08 00:00 – Updated: 2024-08-05 12:47
VLAI
Summary
Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/pyca/pyopenssl/pull/723 | |
| https://access.redhat.com/errata/RHSA-2019:0085 | vendor-advisory |
| https://usn.ubuntu.com/3813-1/ | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| https://github.com/pyca/pyopenssl/commit/e7381860… |
Date Public
2017-11-29 00:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T12:47:56.674Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://github.com/pyca/pyopenssl/pull/723"
},
{
"name": "RHSA-2019:0085",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://access.redhat.com/errata/RHSA-2019:0085"
},
{
"name": "USN-3813-1",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://usn.ubuntu.com/3813-1/"
},
{
"name": "openSUSE-SU-2019:1104",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"dateAssigned": "2018-10-05T00:00:00.000Z",
"datePublic": "2017-11-29T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-11-17T22:10:00.975Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://github.com/pyca/pyopenssl/pull/723"
},
{
"name": "RHSA-2019:0085",
"tags": [
"vendor-advisory"
],
"url": "https://access.redhat.com/errata/RHSA-2019:0085"
},
{
"name": "USN-3813-1",
"tags": [
"vendor-advisory"
],
"url": "https://usn.ubuntu.com/3813-1/"
},
{
"name": "openSUSE-SU-2019:1104",
"tags": [
"vendor-advisory"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html"
},
{
"url": "https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2018-1000807",
"datePublished": "2018-10-08T00:00:00.000Z",
"dateReserved": "2018-09-20T00:00:00.000Z",
"dateUpdated": "2024-08-05T12:47:56.674Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2026-27459 (GCVE-0-2026-27459)
Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-06-30 12:08
VLAI
Title
pyOpenSSL DTLS cookie callback buffer overflow
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
23 references
Impacted products
31 products
| Vendor | Product | Version | |
|---|---|---|---|
| pyca | pyopenssl |
Affected:
>= 22.0.0, < 26.0.0
|
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
cpe:/a:redhat:ansible_automation_platform:2.5::el8 cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8 cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8 |
|
| Red Hat | RHUI 4 for RHEL 8 |
cpe:/a:redhat:rhui:4::el8 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 |
cpe:/a:redhat:satellite:6.16::el8 cpe:/a:redhat:satellite_capsule:6.16::el8 cpe:/a:redhat:satellite_utils:6.16::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
cpe:/a:redhat:ansible_automation_platform:2.5::el9 cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9 cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
cpe:/a:redhat:ansible_automation_platform:2.6::el9 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9 cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9 |
|
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 |
cpe:/a:redhat:satellite:6.16::el9 cpe:/a:redhat:satellite_capsule:6.16::el9 cpe:/a:redhat:satellite_utils:6.16::el9 |
|
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 |
cpe:/a:redhat:satellite:6.17::el9 cpe:/a:redhat:satellite_capsule:6.17::el9 cpe:/a:redhat:satellite_utils:6.17::el9 |
|
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 |
cpe:/a:redhat:satellite:6.18::el9 cpe:/a:redhat:satellite_capsule:6.18::el9 cpe:/a:redhat:satellite_maintenance:6.18::el9 cpe:/a:redhat:satellite_utils:6.18::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.5 |
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Quay 3.12 |
cpe:/a:redhat:quay:3.12::el8 |
|
| Red Hat | Red Hat Quay 3.14 |
cpe:/a:redhat:quay:3.14::el8 |
|
| Red Hat | Red Hat Quay 3.15 |
cpe:/a:redhat:quay:3.15::el8 |
|
| Red Hat | Red Hat Quay 3.16 |
cpe:/a:redhat:quay:3.16::el9 |
|
| Red Hat | Red Hat Quay 3.17 |
cpe:/a:redhat:quay:3.17::el9 |
|
| Red Hat | Red Hat Quay 3.1 |
cpe:/a:redhat:quay:3.10::el8 |
|
| Red Hat | Red Hat Quay 3.9 |
cpe:/a:redhat:quay:3.9::el8 |
|
| Red Hat | Red Hat Trusted Artifact Signer 1.4 |
cpe:/a:redhat:trusted_artifact_signer:1.4::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 |
cpe:/a:redhat:ansible_core:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 10 |
cpe:/a:redhat:ansible_automation_platform:2.6::el10 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10 |
|
| 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 OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
|
| Red Hat | Red Hat OpenStack Platform 17.1 |
cpe:/a:redhat:openstack:17.1 |
|
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0 |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27459",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-18T19:52:08.536876Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-18T19:52:15.812Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"affected": [
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el8",
"cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8",
"cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:rhui:4::el8"
],
"defaultStatus": "affected",
"product": "RHUI 4 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.16::el8",
"cpe:/a:redhat:satellite_capsule:6.16::el8",
"cpe:/a:redhat:satellite_utils:6.16::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.16 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el9",
"cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9",
"cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el9",
"cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9",
"cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.6 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.16::el9",
"cpe:/a:redhat:satellite_capsule:6.16::el9",
"cpe:/a:redhat:satellite_utils:6.16::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.16 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.17::el9",
"cpe:/a:redhat:satellite_capsule:6.17::el9",
"cpe:/a:redhat:satellite_utils:6.17::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.17 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.18::el9",
"cpe:/a:redhat:satellite_capsule:6.18::el9",
"cpe:/a:redhat:satellite_maintenance:6.18::el9",
"cpe:/a:redhat:satellite_utils:6.18::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.18 for RHEL 9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.5::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.5",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2.6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:hummingbird:1"
],
"defaultStatus": "affected",
"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.12::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.12",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.14::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.14",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.15::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.15",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.16::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.16",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.17::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.17",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.10::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.1",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:quay:3.9::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Quay 3.9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:trusted_artifact_signer:1.4::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Trusted Artifact Signer 1.4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_core:2"
],
"defaultStatus": "affected",
"product": "Red Hat Ansible Automation Platform Ansible Core 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_ai"
],
"defaultStatus": "affected",
"product": "Red Hat OpenShift AI (RHOAI)",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ansible_automation_platform:2.6::el10",
"cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10"
],
"defaultStatus": "unaffected",
"product": "Red Hat Ansible Automation Platform 2.6 for RHEL 10",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:6"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 6",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:7"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 7",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:8"
],
"defaultStatus": "unaffected",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift:4"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenShift Container Platform 4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openstack:17.1"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenStack Platform 17.1",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openstack:18.0"
],
"defaultStatus": "unaffected",
"product": "Red Hat OpenStack Platform 18.0",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6"
],
"defaultStatus": "unaffected",
"product": "Red Hat Satellite 6",
"vendor": "Red Hat"
}
],
"datePublic": "2026-03-17T23:34:28.483Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in pyOpenSSL. The set_cookie_generate_callback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a fixed-size buffer provided by the underlying OpenSSL library."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-30T12:08:07.873Z",
"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"shortName": "redhat-SADP"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-27459"
},
{
"name": "RHBZ#2448503",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448503"
},
{
"tags": [
"x_sadp-csaf-vex"
],
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13512"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:10754"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14874"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13508"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14873"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:14835"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13553"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:13545"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:7224"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11856"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:21017"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:24853"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:19375"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:22465"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11916"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:11996"
},
{
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:8437"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:13512: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:10754: RHUI 4 for RHEL 8"
},
{
"lang": "en",
"value": "RHSA-2026:14874: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:13508: Red Hat Ansible Automation Platform 2.6 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:14873: Red Hat Satellite 6.17 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:14835: Red Hat Satellite 6.18 for RHEL 9"
},
{
"lang": "en",
"value": "RHSA-2026:13553: Red Hat Ansible Automation Platform 2.5"
},
{
"lang": "en",
"value": "RHSA-2026:13545: Red Hat Ansible Automation Platform 2.6"
},
{
"lang": "en",
"value": "RHSA-2026:7224: Red Hat Hardened Images"
},
{
"lang": "en",
"value": "RHSA-2026:11856: Red Hat Quay 3.12"
},
{
"lang": "en",
"value": "RHSA-2026:21017: Red Hat Quay 3.14"
},
{
"lang": "en",
"value": "RHSA-2026:24853: Red Hat Quay 3.15"
},
{
"lang": "en",
"value": "RHSA-2026:19375: Red Hat Quay 3.16"
},
{
"lang": "en",
"value": "RHSA-2026:22465: Red Hat Quay 3.17"
},
{
"lang": "en",
"value": "RHSA-2026:11916: Red Hat Quay 3.1"
},
{
"lang": "en",
"value": "RHSA-2026:11996: Red Hat Quay 3.9"
},
{
"lang": "en",
"value": "RHSA-2026:8437: Red Hat Trusted Artifact Signer 1.4"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-18T00:01:41.404Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-03-17T23:34:28.483Z",
"value": "Made public."
}
],
"title": "pyOpenSSL: DTLS cookie callback buffer overflow",
"workarounds": [
{
"lang": "en",
"value": "To mitigate this flaw, ensure the callback provided to the set_cookie_generate_callback function strictly limits the returned cookie string or byte sequence to under 256 bytes."
}
],
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
}
],
"cna": {
"affected": [
{
"product": "pyopenssl",
"vendor": "pyca",
"versions": [
{
"status": "affected",
"version": "\u003e= 22.0.0, \u003c 26.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120: Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-17T23:34:28.483Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4"
},
{
"name": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408"
},
{
"name": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst"
}
],
"source": {
"advisory": "GHSA-5pwr-322w-8jr4",
"discovery": "UNKNOWN"
},
"title": "pyOpenSSL DTLS cookie callback buffer overflow"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27459",
"datePublished": "2026-03-17T23:34:28.483Z",
"dateReserved": "2026-02-19T17:25:31.100Z",
"dateUpdated": "2026-06-30T12:08:07.873Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-27448 (GCVE-0-2026-27448)
Vulnerability from cvelistv5 – Published: 2026-03-17 23:24 – Updated: 2026-03-18 20:18
VLAI
Title
pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
Summary
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pyca/pyopenssl/security/adviso… | x_refsource_CONFIRM |
| https://github.com/pyca/pyopenssl/commit/d41a8147… | x_refsource_MISC |
| https://github.com/pyca/pyopenssl/blob/358cbf29c4… | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-27448",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-18T20:17:52.492201Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-18T20:18:08.768Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "pyopenssl",
"vendor": "pyca",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.14.0, \u003c 26.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "HIGH",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 1.7,
"baseSeverity": "LOW",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-636",
"description": "CWE-636: Not Failing Securely (\u0027Failing Open\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-17T23:24:30.661Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-vp96-hxj8-p424"
},
{
"name": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/commit/d41a814759a9fb49584ca8ab3f7295de49a85aa0"
},
{
"name": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst#L27"
}
],
"source": {
"advisory": "GHSA-vp96-hxj8-p424",
"discovery": "UNKNOWN"
},
"title": "pyOpenSSL allows TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-27448",
"datePublished": "2026-03-17T23:24:30.661Z",
"dateReserved": "2026-02-19T17:25:31.100Z",
"dateUpdated": "2026-03-18T20:18:08.768Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2018-1000807 (GCVE-0-2018-1000807)
Vulnerability from cvelistv5 – Published: 2018-10-08 00:00 – Updated: 2024-08-05 12:47
VLAI
Summary
Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/pyca/pyopenssl/pull/723 | |
| https://access.redhat.com/errata/RHSA-2019:0085 | vendor-advisory |
| https://usn.ubuntu.com/3813-1/ | vendor-advisory |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisory |
| https://github.com/pyca/pyopenssl/commit/e7381860… |
Date Public
2017-11-29 00:00
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T12:47:56.674Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://github.com/pyca/pyopenssl/pull/723"
},
{
"name": "RHSA-2019:0085",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://access.redhat.com/errata/RHSA-2019:0085"
},
{
"name": "USN-3813-1",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://usn.ubuntu.com/3813-1/"
},
{
"name": "openSUSE-SU-2019:1104",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html"
},
{
"tags": [
"x_transferred"
],
"url": "https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"dateAssigned": "2018-10-05T00:00:00.000Z",
"datePublic": "2017-11-29T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-11-17T22:10:00.975Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://github.com/pyca/pyopenssl/pull/723"
},
{
"name": "RHSA-2019:0085",
"tags": [
"vendor-advisory"
],
"url": "https://access.redhat.com/errata/RHSA-2019:0085"
},
{
"name": "USN-3813-1",
"tags": [
"vendor-advisory"
],
"url": "https://usn.ubuntu.com/3813-1/"
},
{
"name": "openSUSE-SU-2019:1104",
"tags": [
"vendor-advisory"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.html"
},
{
"url": "https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2018-1000807",
"datePublished": "2018-10-08T00:00:00.000Z",
"dateReserved": "2018-09-20T00:00:00.000Z",
"dateUpdated": "2024-08-05T12:47:56.674Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}