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CVE-2025-62801

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Date: 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.

Severity Score

Related Resources (4)

https://github.com/jlowin/fastmcp
https://nvd.nist.gov/vuln/detail/CVE-2025-62801
https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5
https://www.mend.io/vulnerability-database/CVE-2025-62801

Severity Score

Weakness Type (CWE)

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE-78

Top Fix

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Upgrade Version

Upgrade to version fastmcp - 2.13.0;fastmcp - 2.13.0;fastmcp - 2.13.0

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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