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critical vulnerability

FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability

Fix availableCritical · CVSS 10EPSS 0.91%

Published Mar 31, 2026 · updated Oct 27, 2026

What to do

  1. Upgrade to a fixed version: fastmcp 3.2.0.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIfastmcp13,985,354 downloads/week

Vulnerable versions
< 3.2.0
Fixed in
3.2.0

Check your project: pip show fastmcp

Sources

CWE-918 Server-Side Request Forgery (SSRF)

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