All findings

CVE-2026-53583 medium

AISLE backfill adds a libgit2 certificate-validation CVE

CVE-2026-53583 is a libgit2 OpenSSL-backend comparison error that can accept a certificate whose IP Subject Alternative Name does not match.

Bug class
Improper certificate validation
Affected codebase
libgit2 OpenSSL backend
Credited system
AISLE
Disclosed
July 18, 2026
Attribution
Self-reported attribution
AI role
Discovery
Severity
medium
Source status: AISLE attributes discovery to its platform. The libgit2 project GHSA independently confirms CVE-2026-53583 and rates it moderate, CVSS 6.5.

Summary

An inverted comparison in libgit2’s OpenSSL backend can treat a mismatched IP Subject Alternative Name as a match, weakening server-authenticity checks. The project advisory was public on July 18; the CVE record followed on August 20.

The severity follows the upstream project rating of moderate 6.5. The AI role remains self-reported because the project confirms the vulnerability while AISLE’s registry supplies the model-workflow attribution.


References


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