---
schema_version: '1.0'
id: security-20260705-a527cd
url: https://osv.dev/vulnerability/GHSA-rcfx-77hg-w2wv
url_hash: a527cda9938b0070518cfee0e1acc23f1f3b351a0f2add5a423d231c627a8289
canonical_url: https://osv.dev/vulnerability/GHSA-rcfx-77hg-w2wv
source: osv:ghsa
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- GHSA-rcfx-77hg-w2wv
- severity:HIGH
- fastmcp
- PyPI
lang: en
published_at: '2025-12-26T23:20:50Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-11T06:37:45Z'
status: published
content_hash: cd96ef716b041e7b65a6627bc446d317baf87fda260cbf2e29ce8699d970cf11
license_note: full
summary: FastMCP updated to MCP 1.23+ due to CVE-2025-66416
summary_source: rss
summary_en: FastMCP updated to MCP 1.23+ due to CVE-2025-66416
entities:
- name: updated-since
  type: method
- name: MCP portal_list
  type: artifact
- name: Papa Fries 6 Cheese Fondue
  type: artifact
related_auto:
- name: mcp server-card
  type: artifact
  weight: 1.0
- name: portal_search
  type: method
  weight: 1.0
title: 'GHSA-rcfx-77hg-w2wv: FastMCP updated to MCP 1.23+ due to CVE-2025-66416'
---

# GHSA-rcfx-77hg-w2wv: FastMCP updated to MCP 1.23+ due to CVE-2025-66416

## TL;DR
FastMCP updated to MCP 1.23+ due to CVE-2025-66416

## Key Points
- cve / GHSA-rcfx-77hg-w2wv / severity:HIGH / fastmcp / PyPI

## Details
**Severity:** HIGH
**Advisory:** GHSA-rcfx-77hg-w2wv

**Affected (your watchlist):**
- `PyPI:fastmcp` 2.11.3 → fixed in 2.14.0 [docker/docker-portal+portal]

**Details:**
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.

**References:**
- https://github.com/jlowin/fastmcp/security/advisories/GHSA-rcfx-77hg-w2wv
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-9h52-p55h-vw2f
- https://nvd.nist.gov/vuln/detail/CVE-2025-66416
- https://github.com/jlowin/fastmcp

_Data: OSV.dev (upstream: ghsa) — https://osv.dev/vulnerability/GHSA-rcfx-77hg-w2wv_

## Source
元記事: [GHSA-rcfx-77hg-w2wv: FastMCP updated to MCP 1.23+ due to CVE-2025-66416](https://osv.dev/vulnerability/GHSA-rcfx-77hg-w2wv) — published 2025-12-26T23:20:50Z