FastMCP updated to MCP 1.23+ due to CVE-2025-66416
Priority LOW 38Published · Updated
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
There was a recent CVE report on MCP: https://nvd.nist.gov/vuln/detail/CVE-2025-66416. FastMCP does not use any of the affected components of the MCP SDK directly. However, FastMCP versions prior to 2.14.0 did allow MCP SDK versions <1.23 that were vulnerable to CVE-2025-66416. Users should upgrade to FastMCP 2.14.0 or later.
Why it matters now
Fix Fixed fastmcp (PyPI): 2.14.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | fastmcp (PyPI) | before 2.14.0 | 2.14.0 | Patch available | GHSA-rcfx-77hg-w2wv |
- fastmcp (PyPI) Vendor— Affected before 2.14.0 Fixed in 2.14.0 Patch available GHSA-rcfx-77hg-w2wv
Remediation
- Fix · GHSA-rcfx-77hg-w2wv fastmcp (PyPI) Fixed in 2.14.0 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-rcfx-77hg-w2wv
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences