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CVE-2025-64340

FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has bee
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2ee5f4a0686429485319a41c66c371c92bd0ae9e1e6c37e59b3ce3867fe11255
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":"< 3.2.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.7,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /containers/cna/metrics/0/cvssV3_1

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:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/PrefectHQ/fastmcp/pull/3522","tags":["x_refsource_MISC"],"url":"https://github.com/PrefectHQ/fastmcp/pull/3522"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /containers/cna/references/1
{"name":"https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-m8x7-r2rg-vh5g","tags":["x_refsource_CONFIRM"],"url":"https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-m8x7-r2rg-vh5g"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-m8x7-r2rg-vh5g"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4c51418fffd1711b1a35d600398a5b8ffdd86360d918c2487e7e2eb9d49ee0e2 · sha256:3e4e9a462ee0bea9… · /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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