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  4. CVE 2026 115557 distrust compromised intermediate certificates in
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Back to active CVEs
Critical · CVSS 9.4CVE-2026-115557

Distrust compromised intermediate certificates in ssl moduleCVE-2026-115557

Answer in brief

CVE-2026-115557 records a Critical severity (CVSS 9.4) vulnerability in Distrust compromised intermediate certificates in ssl module. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 24, 2026Updated Oct 24, 2026Source checked Oct 24, 2026First seen by HOL Oct 24, 2026Material review Oct 24, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Python Software Foundation/CPythongeneric>=0 <=3.16.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Python Software Foundation/CPython.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 24, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 24, 2026

Sources and claim methodology

  • Source referenceemudhra.we-have-a-problem.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencemail.python.org
  • Source referenceopenwall.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-299
Source
CVE List V5
Source checked
Oct 24, 2026
References
5 linked sources
Open source record