CVE-2026-73621

Name	CVE-2026-73621
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).
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1144344

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-git (PTS)	bullseye	3.1.14-1	vulnerable
	bullseye (security)	3.1.14-1+deb11u1	vulnerable
	bookworm	3.1.30-1+deb12u2	vulnerable
	trixie	3.1.44-1	vulnerable
	forky, sid	3.1.50-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-git	source	(unstable)	(unfixed)			1144344

https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24