CVE-2026-87818 [MEDIUM] – GitPython 3.1.59 fails to restrict the –no-index option in the high-level diff API, allow

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.