CVE-2026-87818

GitPython 3.1.59 fails to restrict the --no-index option in the high-level diff API, allowing attackers to read arbitrary filesystem paths as repository operands. Attackers can combine --no-index with -I/--ignore-matching-lines to create a content-dependent Boolean oracle, repeatedly querying local files to recover single-line secrets through distinguishable success or error responses.

  • Published Sep 9, 2026
  • CVSS 7.1 high
  • 0.4% chance of exploitation in the next 30 days (EPSS)
  • Public exploit code is available

Affected software

CVE-2026-87818 at the National Vulnerability Database