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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2025-64340)

ID	Name	Product	Family	Type	Severity
458514	Echo: fastmcp: security update to 3.2.0	Tenable Cloud Security	Echo Local Security Checks	Local	high
458514	Echo: fastmcp: security update to 3.2.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
439568	SCA: security update for fastmcp (GHSA-m8x7-r2rg-vh5g)	Tenable Cloud Security	SCA Checks	Local	high
439568	SCA: security update for fastmcp (GHSA-m8x7-r2rg-vh5g)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2025-64340

high

Tenable Plugins

high

high

high

high