CVE-2025-64340 — FastMCP has a Command Injection vulnerability - Gemini CLI
FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Wi…
Published: 2026-04-03 · CVSS: 6.7 · CVSS 3.1
FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has been patched in version 3.2.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7