{"id":"CVE-2026-73621","aliases":["GHSA-p538-c434-8v24","PYSEC-2026-3950"],"url":"https://o3.security/vulnerability/CVE-2026-73621","summary":"GitPython before 3.1.56 Arbitrary File Truncation via Commit.count","details":"GitPython before 3.1.56 contains an argument injection vulnerability in the Commit.count() method, which forwards keyword arguments to 'git rev-list' without the check_unsafe_options guard present in the sibling iter_items method. An attacker who can control options passed to Commit.count (e.g., via an application that forwards a user-supplied options dict) can supply output=<path>, causing 'git rev-list --output=<path>' to open and truncate the target file to zero bytes before revision parsing. This allows destruction/blanking of an arbitrary file at the process's privilege level (no content control, 0-byte truncation).","published":"2026-08-13T11:28:22.108Z","modified":"2026-09-13T18:26:40.696981586Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"gitpython","fixedVersion":"3.1.56"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73621.json"},{"type":"ADVISORY","url":"https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73621"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-13T18:26:40.696981586Z"}}