mcp-server-git argument injection in git_diff and git_checkout functions allows overwriting local files
In mcp-server-git versions prior to 2025.12.18, the git_diff and git_checkout functions passed user-controlled arguments directly to git CLI commands without sanitization. Flag-like values (e.g., --output=/path/to/file for git_diff) would be interpreted as command-line options rather than git refs, enabling arbitrary file overwrites. The fix adds validation that rejects arguments starting with - and verifies the argument resolves to a valid git ref via rev_parse before execution. Users are advised to update to 2025.12.18 resolve this issue.
Thank you to https://hackerone.com/yardenporat for reporting.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | mcp-server-git | < 2025.12.18 | 2025.12.18 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:H/SA:L- Weakness (CWE)
CWE-88- Platform
- Python (PyPI)
- Package
mcp-server-git- Disclosed
- 17.12.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1622 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-9xwc-hfwc-8w59 - CC BY 4.0
Vulnerability history: mcp-server-git
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 4
- First → latest
- 12.2025 02.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 4
Disclosures per year
- 2025: 3
- 2026: 1
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mcp-server-git argument injection in git_diff and git_checkout functions allows overwriting local files this entry
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