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In limbo for 25 days

GHSA-cg3c-5x66-h9cc

fastmcp on PyPI · published in prefecthq/fastmcp

Read the advisory on GitHub ↗

Fixed in 3.4.9. Dependabot, npm audit and OSV-Scanner won’t flag this yet. Find it in your project

Facts

Severity
High · CVSS score 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected versions (fastmcp)
>= 3.1.0, < 3.4.9As entered by the maintainer. Not reviewed.
Fixed in (fastmcp)
3.4.9
Affected versions (fastmcp)
>= 4.0.0a1, < 4.1.1As entered by the maintainer. Not reviewed.
Fixed in (fastmcp)
4.1.1
Affected versions (fastmcp-slim)
>= 4.0.0a1, < 4.1.1As entered by the maintainer. Not reviewed.
Fixed in (fastmcp-slim)
4.1.1
CVE
None cited by the advisory
GitHub Advisory Database
Not reviewed
OSV.dev
Not present
Other CVEs pointing here
None found in the CVE List

If you use fastmcp >= 3.1.0, < 3.4.9

Upgrade to 3.4.9 or later. Dependabot, npm audit and OSV-Scanner won’t flag this yet.

Timeline

  1. 2026-10-18 14:41 UTC

    Published by the maintainers

    No CVE cited

  2. 2026-10-28 08:43 UTC

    First seen by Limbowatch

    not reviewed · not in OSV

  3. Waiting

    Reviewed by GitHub

  4. Waiting

    In OSV; scanners can see it

Machine-readable record: feed/GHSA-cg3c-5x66-h9cc.json