{"cve":"CVE-2026-115557","nvd":{"published":"2026-10-24T15:17:33.600","modified":"2026-10-26T01:17:14.870","status":"Received","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.","cvss_v4":{"vector":"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","score":9.4},"cvss_v3":null,"cwes":["CWE-299"],"references":["http://www.openwall.com/lists/oss-security/2026/10/20/29","https://emudhra.we-have-a-problem.com/","https://github.com/python/cpython/commit/21a50891ab4be2e9955239e625ae2b40c6b1854d","https://github.com/python/cpython/commit/36cd295f32fc9ba19399e01abee91231440a41dd","https://github.com/python/cpython/commit/48d9b2712cd52206c7a5882d0fdca4863ed65e93"],"products":[],"source":"nvd","synced_at":"2026-10-26T01:35:02.680761403+00:00"},"epss":{"cve":"CVE-2026-115557","score":0.00534,"percentile":0.44815,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}