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CVE-2025-62801

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2d34eb283febe29c93955e35200624f4ab3a1fd5b8ce5de389bd5a4478ec8534
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"fastmcp","vendor":"jlowin","versions":[{"status":"affected","version":"< 2.13.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1b63662917c5d34c86923601e171882709a86ddc1fd64ccfc7e91dad839d3c01 · sha256:a25dfdc98685faa0… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.4,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1b63662917c5d34c86923601e171882709a86ddc1fd64ccfc7e91dad839d3c01 · sha256:a25dfdc98685faa0… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1b63662917c5d34c86923601e171882709a86ddc1fd64ccfc7e91dad839d3c01 · sha256:a25dfdc98685faa0… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5","tags":["x_refsource_CONFIRM"],"url":"https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1b63662917c5d34c86923601e171882709a86ddc1fd64ccfc7e91dad839d3c01 · sha256:a25dfdc98685faa0… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/jlowin/fastmcp/security/advisories/GHSA-rj5c-58rq-j5g5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1b63662917c5d34c86923601e171882709a86ddc1fd64ccfc7e91dad839d3c01 · sha256:a25dfdc98685faa0… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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