Vulnerability in Gitpython-Developers Gitpython
CVE-2026-73621
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 · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (27.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Gitpython-Developers Gitpython — versions 0, 3.1.56
- Gitpython Project
Weakness classification (CWE)
References
- github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v… (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-com… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-73621?
- CVE-2026-73621 is a medium-severity vulnerability in Gitpython-Developers Gitpython, classified under Argument Injection. CVSS score: 5.4/10. Published 2026-08-13.
- How severe is CVE-2026-73621?
- Medium severity. CVSS v3 base score is 5.4 out of 10.