Medium

Argument injection in mcp-server-git git_diff and git_checkout

IdentifiersCVE-2025-68144CWE-88· Improper Neutralization of…

CVE-2025-68144 is an argument injection vulnerability in Anthropic's mcp-server-git affecting versions prior to 2025.12.18. The git_diff and git_checkout functions pass user-controlled arguments directly to underlying git CLI/GitPython invocations without sanitization. In the documented vulnerable pattern, git_diff calls repo.git.diff(f"--unified={context_lines}", target), where the attacker-controlled target parameter is forwarded as a raw git argument. Because values beginning with '-' are interpreted by git as command-line options rather than refs or paths, an attacker can inject git flags such as --output=/path/to/file. This allows the attacker to alter command behavior and direct diff output to arbitrary filesystem locations reachable by the server. Reported fixes add validation to reject arguments starting with '-' and verify that the supplied value resolves to a valid git ref via rev-parse before execution.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary file overwrite within the filesystem permissions of the mcp-server-git process. Because git diff output may be empty, this can be used to truncate or effectively delete files by overwriting them with an empty diff. In isolation, the issue enables destructive file tampering against files accessible to the server. In the reported MCP attack chains, it can also contribute to broader compromise when combined with other vulnerabilities and a file-writing capability, ultimately supporting code execution through malicious Git configuration and filter abuse.

Mitigation

If you can’t patch tonight, do this now.

Until patched, restrict exposure of mcp-server-git to trusted inputs and workflows only, and do not allow untrusted prompt content, repository content, issue text, or web content to drive tool arguments. Run the server with least-privilege filesystem permissions so it cannot overwrite sensitive files. Avoid deploying it alongside MCP tools that provide arbitrary file-write capability where possible, because cross-tool chaining materially increases impact. Monitor for suspicious git invocations containing flag-like ref arguments and unexpected file modifications caused by the service account.

Remediation

Patch, then assume compromise.

Upgrade mcp-server-git to version 2025.12.18 or later. The fix rejects flag-like arguments beginning with '-' for affected operations and validates that supplied arguments resolve to legitimate git refs before invoking git. If maintaining a fork or backport, ensure git_diff and git_checkout do not pass untrusted input as raw positional CLI arguments and enforce strict argument validation/allowlisting.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

LfprojectsModel Context Protocol Serversapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

17 SOURCESView more in app

checkpoint research blogNews

Jan 26, 2026

26th January - Threat Intelligence Report - Check Point Research

High-severity vulnerability in Anthropic’s mcp-server-git (Git MCP server) enabling path traversal/argument injection via prompt injection, potentially leading to file read/delete and remote code execution.

the hacker newsNews

Jan 26, 2026

⚡ Weekly Recap: Firewall Flaws, AI-Built Malware, Browser Traps, Critical CVEs & More

Unknown

scworldNews

Jan 21, 2026

Anthropic patches critical vulnerabilities in Git MCP server | SC Media

An argument injection vulnerability in the git_diff functionality of Anthropic’s Git MCP server that can be chained with other MCP tools to enable remote code execution or file overwrites, typically triggered through indirect prompt injection content in repos/issues.

techradarNews

Jan 21, 2026

Anthropic's official Git MCP server had some worrying security flaws - this is what happened next | TechRadar

An argument injection flaw in the git_diff functionality of Anthropic's Git MCP server that researchers said could be chained with other MCP tools, particularly the Filesystem MCP server, to enable remote code execution or file tampering through prompt injection.

+6 more in the timeline

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity7