CVE-2026-27735 mcp-server-git : Path traversal in git_add allows staging files outside repository boundaries
Attackers can stage files outside the repository boundaries via path traversal in the git_add tool of the MCP Git server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-27735?
CVE-2026-27735 is a medium-severity path traversal vulnerability in modelcontextprotocol servers, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). In mcp-server-git versions prior to 2026.1.14, the git_add tool did not validate that file paths provided in the files argument were within the repository boundaries. Because the tool used GitPython's repo.index.add() rather than the Git CLI, relative paths containing `../` sequences that resolve outside the repository were accepted and staged into the Git index. Users are advised to upgrade to 2026.1.14 or newer to remediate this issue.
Weakness: CWE-22
Which versions are affected by CVE-2026-27735?
3 open source packages ship an affected version, including mcp-server-git. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mcp-server-git PyPI | All versions | 2026.1.14 |
mcp-server-git PyPI | All versions | 2026.1.14 |
mcp-server-git PyPI | All versions | 2026.1.14 |
Products include Lfprojects Model Context Protocol Servers.
How do I fix CVE-2026-27735?
Upgrade mcp-server-git to 2026.1.14 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-27735 being exploited?
There is no known exploitation of CVE-2026-27735 in the wild and no public exploit code.
Other vulnerabilities in modelcontextprotocol servers
- CVE-2025-68143 mcp-server-git's unrestricted git_init tool allows repository creation at arbitrary filesystem locations
- CVE-2025-68145 mcp-server-git has missing path validation when using --repository flag
- CVE-2025-68144 mcp-server-git argument injection in git_diff and git_checkout functions allows overwriting local files
Sources
Also known as GHSA-vjqx-cfc4-9h6v, MINI-mch8-8h85-3j5v, PYSEC-2026-2630.