CVE-2026-77889 Windows DHCP Server Denial of Service Vulnerability

{
  "id": "9be33d23c97cb0bd2f8b02c36d80e2ef83ae64294fd7d8e3b454f54c0787da27",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77889",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-77889 Windows DHCP Server Denial of Service Vulnerability",
    "summary": "An unauthorized attacker can cause a denial of service over a network by exploiting type confusion in Windows DHCP Server.",
    "evidence": "Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.",
    "products": [
      {
        "name": {
          "value": "Windows DHCP Server",
          "evidence": "Access of resource using incompatible type ('type confusion') in Windows DHCP Server"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-77889",
        "evidence": "CVE-2026-77889 Windows DHCP Server Denial of Service Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 26682,
  "published_at": "2026-09-08T14:00:00+00:00"
}