6.7
Medium
CVE-2025-64340 FastMCP is the standard framework for building MCP applications
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| fastmcp 3.2 | earliest → < 3.2.0 | 3.2.0 |
Other CVEs of fastmcp
The 5 CVEs of fastmcp →
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CVE-2025-69196
FastMCP is the standard framework for building MCP applications
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CVE-2025-62801
FastMCP is the standard framework for building MCP applications
5.4
Medium
CVE-2025-62800
FastMCP is the standard framework for building MCP applications
5.3
Medium