CVE-2026-115557
Full vulnerability record from the local CVENow database.
Description
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.
Severity
CRITICAL
CVSS score
9.4
(v4.0)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-10-24 15:17:33.600000
Last modified
2026-10-27 01:19:05.560000
View original CVE JSON
{
"id": "CVE-2026-115557",
"sourceIdentifier": "[email protected]",
"published": "2026-10-24T15:17:33.600",
"lastModified": "2026-10-27T01:19:05.560",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Python has added a denylist for known compromised certificates to the \"ssl\" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Python Software Foundation",
"product": "CPython",
"defaultStatus": "unaffected",
"modules": [
"ssl"
],
"repo": "https://github.com/python/cpython",
"versions": [
{
"version": "0",
"lessThan": "3.11.18",
"versionType": "python",
"status": "affected"
},
{
"version": "3.12.0",
"lessThan": "3.12.16",
"versionType": "python",
"status": "affected"
},
{
"version": "3.13.0",
"lessThan": "3.13.18",
"versionType": "python",
"status": "affected"
},
{
"version": "3.14.0",
"lessThan": "3.14.10",
"versionType": "python",
"status": "affected"
},
{
"version": "3.15.0",
"lessThan": "3.15.2",
"versionType": "python",
"status": "affected"
},
{
"version": "3.16.0a1",
"lessThan": "3.16.0",
"versionType": "python",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"baseScore": 9.4,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "PASSIVE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"subAvailabilityImpact": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-299"
}
]
}
],
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/10/20/29",
"source": "[email protected]"
},
{
"url": "https://emudhra.we-have-a-problem.com/",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/21a50891ab4be2e9955239e625ae2b40c6b1854d",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/36cd295f32fc9ba19399e01abee91231440a41dd",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/48d9b2712cd52206c7a5882d0fdca4863ed65e93",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/7dd8b4736a1419750b94a388e6d158be15836fe6",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/98f0e4ed349f370dc8a00366da1a9797e11c9ed5",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/a17d9ef549008133eadf20689b1f4787902efe5b",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/af52b41afa4330fb38583db553631baa2f122f90",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/c7fd7edf7e0d122a3973cf676fae21b6aaa650a8",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/e2a9dd97ef9571c710ac0afaa834c8879aebce78",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/e4500d8a437ee5b988a5410cb9b59d177aa01370",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/e4f63e65a93cf44c14274aa987e644b8c003625e",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/commit/e9bf2cf84eebf838a1edaa1c648c2b36345b99d3",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/issues/160040",
"source": "[email protected]"
},
{
"url": "https://github.com/python/cpython/pull/160042",
"source": "[email protected]"
},
{
"url": "https://mail.python.org/archives/list/[email protected]/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/",
"source": "[email protected]"
},
{
"url": "http://www.openwall.com/lists/oss-security/2026/10/24/5",
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
]
}