CVE-2026-85626: Argument Injection (CVSS 7.5)

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-88 CWE-88

References

Other 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 https://github.com/cyanheads/git-mcp-server/issues/53

Frequently Asked Questions

What is CVE-2026-85626? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-85626? +

CVE-2026-85626 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-85626? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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