CVE-2025-62801
October 28, 2025
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 Packages
fastmcp (CONDA):
Affected version(s) >=2.3.4 <2.13.0Fix Suggestion:
Update to version 2.13.0fastmcp (PYTHON):
Affected version(s) >=0.1.0 <2.13.0Fix Suggestion:
Update to version 2.13.0fastmcp (PYTHON):
Affected version(s) >=0.1.0 <2.13.0Fix Suggestion:
Update to version 2.13.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.4
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
ACTIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
EPSS
Base Score:
0.03
