CVE-2026-69639 Windows libarchive Remote Code Execution Vulnerability

{
  "id": "337f0327c94265b766696b78d1b2868d93c3c559d218af4209c3aeb2305f0d4f",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69639",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-69639 Windows libarchive Remote Code Execution Vulnerability",
    "summary": "A heap-based buffer overflow in Windows Libarchive could allow an unauthorized attacker to execute code over a network.",
    "evidence": "Heap-based buffer overflow in Windows Libarchive allows an unauthorized attacker to execute code over a network.",
    "products": [
      {
        "name": {
          "value": "Windows Libarchive",
          "evidence": "Windows Libarchive"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-69639",
        "evidence": "CVE-2026-69639 Windows libarchive Remote Code Execution Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 24784,
  "published_at": "2026-10-13T14:00:00+00:00"
}