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.
Published: 2026-10-24
Score: 9.4 Critical
EPSS: n/a
KEV: No
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Remediation

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History

Sat, 24 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
References

Sat, 24 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Python Software Foundation
Python Software Foundation cpython
Vendors & Products Python
Python cpython
Python Software Foundation
Python Software Foundation cpython

Sat, 24 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title Distrust compromised intermediate certificates in ssl module
Weaknesses CWE-299
References
Metrics cvssV4_0

{'score': 9.4, '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'}


Subscriptions

Python Cpython
Python Software Foundation Cpython
cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-10-24T18:07:53.662Z

Reserved: 2026-10-22T21:32:20.396Z

Link: CVE-2026-115557

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-24T15:17:33.600

Modified: 2026-10-24T18:16:48.250

Link: CVE-2026-115557

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-24T16:00:18Z

Weaknesses
  • CWE-299

    Improper Check for Certificate Revocation