CVE-2025-62801: Jlowin Fastmcp

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Jlowin Fastmcp: before 2.13.0 (fixed in 2.13.0)

Published 2025-10-28. Last modified 2026-10-08.