CVE-2026-85821 Windows Universal Disk Format File System Driver (UDFS) Information Disclosure Vulnerability

{
  "id": "c22ea86cb4045b46017a24d0c5c97c170a8b850e7e753fa47957cb40f3809b66",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85821",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-85821 Windows Universal Disk Format File System Driver (UDFS) Information Disclosure Vulnerability",
    "summary": "An out-of-bounds read in UDFS may allow an authorized attacker to disclose information locally.",
    "evidence": "Out-of-bounds read in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to disclose information locally.",
    "products": [
      {
        "name": {
          "value": "Windows Universal Disk Format File System Driver (UDFS)",
          "evidence": "Windows Universal Disk Format File System Driver (UDFS)"
        },
        "prerequisites": [
          {
            "value": "authorized attacker",
            "evidence": "allows an authorized attacker"
          }
        ],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-85821",
        "evidence": "CVE-2026-85821"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25147,
  "published_at": "2026-10-13T14:00:00+00:00"
}