FastMCP — Command Injection (CVE-2025-62801)
Date: 2025-10
Affected: jlowin/fastmcp
Attack vector: command-injection
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2025-62801
CWE: CWE-78
CVSS: 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, a command-injection vulnerability lets any attacker who can influence the server_name field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This vulnerability is fixed in 2.13.0.


Mitigations:

Architectural layers (MAESTRO):