gcdRadar
archive/Patch now/AIR-2026-0539
closedclosed 31 Mar 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-32871: FastMCP OpenAPI Provider SSRF and Path Traversal

FastMCP

The OpenAPIProvider in FastMCP suffers from a server-side request forgery and path traversal vulnerability in its RequestDirector class. Improper URL-encoding of path parameters allows unintended traversal sequences in backend requests.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
10.0
EPSS
0.01 · top 39% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
31 Mar 2026
last update
31 Mar 2026
CVE ids
CVE-2026-32871other records

Timeline · 1

  1. 31 Mar 2026CVE-2026-32871: FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability

Sources · 1

Advisories and databases

  1. 2026-03-31
    CVE-2026-32871: FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability
    GitHub Advisory Database · github.com/advisories/GHSA-vv7q-7jx5-f767

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
ssrfpath-traversal
dates
happened 31 Mar 2026 · first reported 31 Mar 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-32871: FastMCP OpenAPI Provider SSRF and Path Traversal

https://gcdradar.vercel.app/incidents/cve-2026-32871-fastmcp-openapi-provider-ssrf-and-path-traver · AIR-2026-0539 · closed 2026-03-31

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-03-31
- AI role: Attack on AI
- Products: FastMCP
- CVE ids: CVE-2026-32871
- CVSS: 10

## Summary

The OpenAPIProvider in FastMCP suffers from a server-side request forgery and path traversal vulnerability in its RequestDirector class. Improper URL-encoding of path parameters allows unintended traversal sequences in backend requests.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-03-31: CVE-2026-32871: FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability (https://github.com/advisories/GHSA-vv7q-7jx5-f767)

## Sources

- 2026-03-31 GitHub Advisory Database: CVE-2026-32871: FastMCP OpenAPI Provider has an SSRF & Path Traversal Vulnerability https://github.com/advisories/GHSA-vv7q-7jx5-f767

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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