Wednesday, 28 October 2026
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CVE-2025-64340: Command injection in FastMCP install commands on Windows

FastMCP versions prior to 3.2.0 allow command injection on Windows when a server name containing shell metacharacters is passed to `fastmcp install claude-code` or `fastmcp install gemini-cli`, because the target CLIs resolve to .cmd wrappers executed through cmd.exe. The issue was patched in FastMCP 3.2.0.

Disclosed 3 April 2026 · Record updated 1 October 2026

Impact

Attacker-influenced server names could lead to arbitrary command execution on Windows systems running the affected FastMCP install commands.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2025-64340