CVE-2026-73621

GitPython before 3.1.56 Arbitrary File Truncation via Commit.count

Description

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).

Scores

Weaknesses (CWE)

• CWE-88

Advisories

• GHSA-p538-c434-8v24 — GitPython: Arbitrary file truncation via git rev-list --output argument injection in unguarded Commit.count
• PYSEC-2026-3950 — GitPython before 3.1.56 contains an argument injection vulnerability in the Commit.count() method, which forwards keyword arguments to 'git rev-list' without th

European references

• ENISA EUVD · EUVD-2026-57825
• GCVE · GCVE-0-2026-73621

Affected configurations (NVD CPE)

• cpe:2.3:a:gitpython_project:gitpython:*:*:*:*:*:python:*:* < 3.1.56

Affected products

References

• https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24
• https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count

Sources