{
 "id": "AIR-2025-0271",
 "slug": "vllm-vulnerable-to-denial-of-service-by-abusing-xgrammar-cac",
 "title": "vLLM Vulnerable to Denial of Service by Abusing XGrammar Cache",
 "summary": "vLLM was found vulnerable to denial of service attacks through the XGrammar structured output cache. Users were advised to update affected components.",
 "type": "attack_on_ai",
 "categories": [
  "infra_vuln"
 ],
 "severity": 2,
 "targets": [
  "framework_or_tooling"
 ],
 "products": [
  "vLLM",
  "XGrammar"
 ],
 "incident_date": "2025-04-15",
 "incident_date_precision": "day",
 "first_reported": "2025-04-15",
 "sources": [
  {
   "url": "https://github.com/advisories/GHSA-hf3c-wxg2-49q9",
   "publisher": "GitHub Advisory Database",
   "title": "GHSA-hf3c-wxg2-49q9: vLLM vulnerable to Denial of Service by abusing xgrammar cache",
   "published_at": "2025-04-15"
  }
 ],
 "source_count": 1,
 "confidence": 0.95,
 "status": "published",
 "origin": "seed_ghsa",
 "tags": [
  "denial-of-service",
  "xgrammar"
 ],
 "created_at": "2026-10-18T07:00:14.101Z",
 "updated_at": "2026-10-18T07:00:14.101Z"
}