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).
INFO
Published Date :
Aug. 13, 2026, 12:17 p.m.
Last Modified :
Oct. 24, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update GitPython to version 3.1.56 or later.
- Review application code for user-controlled options.
- Sanitize or validate options passed to Commit.count().
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-73621.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73621 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-73621
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-73621 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73621 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: GitPython de gitpython-developers, Description: GitPython anterior a la versión 3.1.56 contiene una vulnerabilidad de inyección de argumentos en el método Commit.count(), que reenvía argumentos de palabra clave a ’git rev-list’ sin la protección check_unsafe_options presente en el método hermano iter_items. Un atacante que puede controlar las opciones pasadas a Commit.count (por ejemplo, a través de una aplicación que reenvía un diccionario de opciones proporcionado por el usuario) puede proporcionar output=[path], lo que hace que ’git rev-list --output=[path]’ abra y trunque el archivo objetivo a cero bytes antes del análisis de revisión. Esto permite la destrucción/borrado de un archivo arbitrario al nivel de privilegio del proceso (sin control de contenido, truncamiento a 0 bytes). Title: GitPython de gitpython-developers, Description: GitPython anterior a la versión 3.1.56 contiene una vulnerabilidad de inyección de argumentos en el método Commit.count(), que reenvía argumentos de palabra clave a ’git rev-list’ sin la protección check_unsafe_options presente en el método hermano iter_items. Un atacante que puede controlar las opciones pasadas a Commit.count (por ejemplo, a través de una aplicación que reenvía un diccionario de opciones proporcionado por el usuario) puede proporcionar output=[path], lo que hace que ’git rev-list --output=[path]’ abra y trunque el archivo objetivo a cero bytes antes del análisis de revisión. Esto permite la destrucción/borrado de un archivo arbitrario al nivel de privilegio del proceso (sin control de contenido, truncamiento a 0 bytes). -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: GitPython de gitpython-developers, Description: GitPython anterior a la versión 3.1.56 contiene una vulnerabilidad de inyección de argumentos en el método Commit.count(), que reenvía argumentos de palabra clave a ’git rev-list’ sin la protección check_unsafe_options presente en el método hermano iter_items. Un atacante que puede controlar las opciones pasadas a Commit.count (por ejemplo, a través de una aplicación que reenvía un diccionario de opciones proporcionado por el usuario) puede proporcionar output=[path], lo que hace que ’git rev-list --output=[path]’ abra y trunque el archivo objetivo a cero bytes antes del análisis de revisión. Esto permite la destrucción/borrado de un archivo arbitrario al nivel de privilegio del proceso (sin control de contenido, truncamiento a 0 bytes). -
Initial Analysis by [email protected]
Sep. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:gitpython_project:gitpython:*:*:*:*:*:python:*:* versions up to (excluding) 3.1.56 Added Reference Type VulnCheck: https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24 Types: Exploit, Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 14, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-73621', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-14T18:02:51.509040Z'} -
New CVE Received by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'gitpython-developers', 'product': 'GitPython', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '3.1.56', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '3.1.56', 'versionType': 'semver'}], 'packageURL': 'pkg:pypi/GitPython', 'defaultStatus': 'unaffected'}] Added 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). Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Added CWE CWE-88 Added Reference https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-p538-c434-8v24 Added Reference https://www.vulncheck.com/advisories/gitpython-before-arbitrary-file-truncation-via-commit-count