CVE-2026-85626

Description

git-mcp-server 2.15.1 contains an argument injection vulnerability in the ref and object parameters of git_log, git_diff, and git_show tools that lack leading-dash validation. Attackers can inject git command-line options like --output= to write files outside the repository to arbitrary paths accessible by the process.

References

• https://github.com/cyanheads/git-mcp-server
• https://github.com/cyanheads/git-mcp-server/blob/v2.15.3/src/services/git/providers/cli/operations/commits/log.ts
• https://github.com/cyanheads/git-mcp-server/blob/v2.15.3/src/services/git/providers/cli/utils/command-builder.ts
• https://github.com/cyanheads/git-mcp-server/issues/53
• https://www.vulncheck.com/advisories/git-mcp-server-2.15.1-argument-injection-via-git-ref-parameters