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Vulnerability record · CVE-2025-62801 · published 28 October 2025

CVE-2025-62801: Jlowin fastmcp os command injection vulnerability

Jlowin · Fastmcp

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.

5.4 CVSS 4.0 Medium EPSS 0.21% · top 89.7% CWE-78 · OS command injection
5.4CVSS 4.0 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-62801), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.