Moderate severityNVD Advisory· Published Oct 28, 2025· Updated Oct 29, 2025
FastMCP vulnerable to windows command injection in FastMCP Cursor installer via server_name
CVE-2025-62801
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fastmcpPyPI | < 2.13.0 | 2.13.0 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-rj5c-58rq-j5g5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-62801ghsaADVISORY
- github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5ghsax_refsource_CONFIRMWEB
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