{"id":"CVE-2026-115557","title":"Distrust compromised intermediate certificates in ssl module","summary":"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 SSLC…","severity":"critical","cvss":9.4,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-299"],"vendor":"Python Software Foundation","product":"CPython","affected":["CPython <= 3.16.0"],"published":"2026-10-24","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:20:50.539Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115557","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/10/20/29"},{"url":"https://github.com/python/cpython/pull/160042"},{"url":"https://github.com/python/cpython/issues/160040"},{"url":"https://emudhra.we-have-a-problem.com/"},{"url":"https://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/"}],"tags":["cve.org"],"ingestedAt":"2026-10-24T15:00:18.042Z","slug":"CVE-2026-115557","body":"## Overview\n\nPython 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.\n\n## Affected\n\n- `CPython <= 3.16.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":51.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}