CVE-2026-83649 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

{
  "id": "91bdfcafad1504c7622303e8be5ea3fb590014bef2dc047184833b2af4e61001",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83649",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83649 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability",
    "summary": "An out-of-bounds read in LSASS can allow an authorized attacker to cause a denial of service over a network.",
    "evidence": "Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.",
    "products": [
      {
        "name": {
          "value": "Windows Local Security Authority Subsystem Service (LSASS)",
          "evidence": "Windows Local Security Authority Subsystem Service (LSASS)"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83649",
        "evidence": "CVE-2026-83649 Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 24940,
  "published_at": "2026-10-13T14:00:00+00:00"
}