{
 "id": "AIR-2026-1221",
 "slug": "cve-2026-67431-session-hijacking-vulnerability-in-mcp-ruby-s",
 "title": "CVE-2026-67431: Session Hijacking Vulnerability in MCP Ruby SDK",
 "summary": "A session ownership validation flaw in the MCP Ruby SDK allows attackers with a stolen session identifier to execute tools within a victim's session. The issue was addressed in version 0.23.0.",
 "type": "attack_on_ai",
 "categories": [
  "infra_vuln"
 ],
 "severity": 2,
 "targets": [
  "framework_or_tooling"
 ],
 "products": [
  "mcp gem"
 ],
 "incident_date": "2026-07-29",
 "incident_date_precision": "day",
 "first_reported": "2026-07-29",
 "sources": [
  {
   "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67431",
   "publisher": "NVD",
   "title": "CVE-2026-67431: MCP Ruby SDK is the official Ruby SDK for Model Context Protocol servers and clients.",
   "published_at": "2026-07-29"
  }
 ],
 "source_count": 1,
 "confidence": 0.95,
 "status": "published",
 "origin": "seed_nvd",
 "tags": [
  "CVE-2026-67431",
  "mcp",
  "session-hijacking"
 ],
 "created_at": "2026-10-18T10:04:21.885Z",
 "updated_at": "2026-10-18T10:04:21.885Z"
}