Vulnerability · Published Sep 4, 2026 · Assigned by VulnCheck
CVE-2026-85626git-mcp-server 2.15.1 Argument Injection via Git Ref Parameters
High 7.5
In plain English
A high-severity argument injection in git-mcp-server from cyanheads. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 58.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| cyanheads | git-mcp-server | 0 – through 2.15.3 |
Weakness: CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- GitHub Issue #53 issue-tracking
- https://github.com/cyanheads/git-mcp-server product
- https://github.com/cyanheads/git-mcp-server/blob/v2.15.3/src/services/git/providers/cli/operations/commits/log.ts technical-description
- https://github.com/cyanheads/git-mcp-server/blob/v2.15.3/src/services/git/providers/cli/utils/command-builder.ts technical-description
- VulnCheck Advisory: git-mcp-server 2.15.1 Argument Injection via Git Ref Parameters third-party-advisory