CVE-2026-115557

Distrust compromised intermediate certificates in ssl module

Published Oct 24, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

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
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
PSF
Published
Updated
Nov 10, 2026, 8:09 PM
Reserved
Oct 22, 2026, 9:32 PM
Status
Awaiting Analysis
Published
Oct 24, 2026, 3:17 PM
Modified
Nov 2, 2026, 3:17 PM