CVE-2025-62801

HIGH

fastmcp < 2.13.0 - OS Command Injection via server_name Field

Title source: llm

Description

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.

References (1)

Core 1

Core References

Exploit, Third Party Advisory x_refsource_confirm

https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5

Scores

CVSS v3 7.8

EPSS 0.0005

EPSS Percentile 15.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-78

Status published

Products (2)

jlowin/fastmcp < 2.13.0

pypi/fastmcp 0 - 2.13.0PyPI

Published Oct 28, 2025

Tracked Since Feb 18, 2026