Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.7 | Medium | 3.1 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0075, the 55th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-m8x7-r2rg-vh5g
- OSV: GHSA-m8x7-r2rg-vh5g
- github.com/PrefectHQ/fastmcp/security/advisories/GHSA-m8x7-r2rg-vh5g
- github.com/jlowin/fastmcp/security/advisories/GHSA-m8x7-r2rg-vh5g
- nvd.nist.gov/vuln/detail/CVE-2025-64340
- github.com/PrefectHQ/fastmcp/pull/3522
- github.com/PrefectHQ/fastmcp