CVE-2026-115557

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.53% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 44.8% of scored records. A rank, not a probability.

NVD base score

9.4 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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/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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-10-27.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-24 14:15Z4 DAYS AGO

Last updated

2026-10-27 00:36Z2 DAYS AGO

Reserved

2026-10-22

Assigning CNA

PSF

Record state

PUBLISHED

Severity

Critical (CVSS 9.4)

CNA CVSS 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

Weaknesses

• CWE-299Improper Check for Certificate RevocationBase

Data version

5.2

Document digest

cef3f3e09d7d26fd947104dd47ccedd749f61cba8d49a12971ae76ca6653f14c

• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/10/20/29related
• github.comhttps://github.com/python/cpython/pull/160042patch
• github.comhttps://github.com/python/cpython/issues/160040issue-tracking
• emudhra.we-have-a-problem.comhttps://emudhra.we-have-a-problem.com/third-party-advisory
• mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/vendor-advisory
• github.comhttps://github.com/python/cpython/commit/21a50891ab4be2e9955239e625ae2b40c6b1854dpatch
• github.comhttps://github.com/python/cpython/commit/36cd295f32fc9ba19399e01abee91231440a41ddpatch
• github.comhttps://github.com/python/cpython/commit/48d9b2712cd52206c7a5882d0fdca4863ed65e93patch
• github.comhttps://github.com/python/cpython/commit/7dd8b4736a1419750b94a388e6d158be15836fe6patch
• github.comhttps://github.com/python/cpython/commit/98f0e4ed349f370dc8a00366da1a9797e11c9ed5patch
• github.comhttps://github.com/python/cpython/commit/a17d9ef549008133eadf20689b1f4787902efe5bpatch
• github.comhttps://github.com/python/cpython/commit/af52b41afa4330fb38583db553631baa2f122f90patch
• github.comhttps://github.com/python/cpython/commit/c7fd7edf7e0d122a3973cf676fae21b6aaa650a8patch
• github.comhttps://github.com/python/cpython/commit/e2a9dd97ef9571c710ac0afaa834c8879aebce78patch
• github.comhttps://github.com/python/cpython/commit/e4500d8a437ee5b988a5410cb9b59d177aa01370patch
• github.comhttps://github.com/python/cpython/commit/e4f63e65a93cf44c14274aa987e644b8c003625epatch
• github.comhttps://github.com/python/cpython/commit/e9bf2cf84eebf838a1edaa1c648c2b36345b99d3patch
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/10/24/5