{
 "id": "AIR-2025-0383",
 "slug": "cve-2025-66416-mcp-python-sdk-lacks-default-dns-rebinding-pr",
 "title": "CVE-2025-66416: MCP Python SDK lacks default DNS rebinding protection",
 "summary": "The Model Context Protocol Python SDK fails to enable DNS rebinding protection by default for HTTP servers. Attackers could exploit this via malicious websites to access local MCP resources.",
 "type": "attack_on_ai",
 "categories": [
  "infra_vuln"
 ],
 "severity": 2,
 "targets": [
  "framework_or_tooling"
 ],
 "products": [
  "Model Context Protocol Python SDK"
 ],
 "incident_date": "2025-12-02",
 "incident_date_precision": "day",
 "first_reported": "2025-12-02",
 "sources": [
  {
   "url": "https://github.com/advisories/GHSA-9h52-p55h-vw2f",
   "publisher": "GitHub Advisory Database",
   "title": "CVE-2025-66416: Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default",
   "published_at": "2025-12-02"
  },
  {
   "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66416",
   "publisher": "NVD",
   "title": "CVE-2025-66416: The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP).",
   "published_at": "2025-12-02"
  },
  {
   "url": "https://github.com/advisories/GHSA-rcfx-77hg-w2wv",
   "publisher": "GitHub Advisory Database",
   "title": "GHSA-rcfx-77hg-w2wv: FastMCP updated to MCP 1.23+ due to CVE-2025-66416",
   "published_at": "2025-12-26"
  }
 ],
 "source_count": 3,
 "confidence": 0.95,
 "status": "published",
 "origin": "seed_ghsa",
 "tags": [
  "CVE-2025-66416",
  "dns-rebinding"
 ],
 "created_at": "2026-10-18T07:00:14.101Z",
 "updated_at": "2026-10-18T18:20:34.882Z"
}