Medium [CVE-2026-73621] Arbitrary File Truncation via Commit.count Argument Injection

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=, causing 'git rev-list --output=' 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). A flaw was found in GitPython.

This enables the destruction or blanking of files at the process's privilege level, leading to data loss. Moderate: This GitPython flaw enables arbitrary file truncation to zero bytes when an application passes untrusted input to the `Commit.count()` method.

Exploitation requires an attacker to control arguments supplied to this method, which is not a default behavior in typical Red Hat deployments, thus limiting the direct impact on system integrity. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L).

Weakness: CWE-88.

Affected products named by the advisory: Exploit Intelligence; Migration Toolkit for Applications 8; Pen Drive Powered by Red Hat Lightspeed; Red Hat AI Inference Server; and 6 more.