Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-73621

CVE-2026-73621MEDIUM

gitpython-developers GitPython — GitPython before 3.1.56 Arbitrary File Truncation via Commit.count

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   L   N   N   L   L    5.3   .0036   27.5     —

AFFECTED
  Product    Versions     Fixed
  GitPython  unspecified  3.1.56

TIMELINE
  Aug 13  Reserved by VulnCheck
  Aug 13  Published (CNA: VulnCheck)
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-73621 (gitpython-developers GitPython). Public exploit reference added.

CWE-88 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

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).

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 13, 2026	Reserved	Reserved by VulnCheck
August 13, 2026	Published	Published (CNA: VulnCheck)
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-73621 (gitpython-developers GitPython). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
gitpython-developers	GitPython	—	—	3.1.56

Weaknesses

CWE-88

References (2)

https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24 [Exploit, Vendor Advisory]
https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count [Third Party Advisory]

Authoritative record: CVE-2026-73621 at cve.org

Vendors: gitpython-developers

Weaknesses: CWE-88

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-73621 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.