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CVE-2026-69789 Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

Type: advisorySources: Microsoft security updates

A heap-based buffer overflow in RMCAST allows an unauthorized attacker to execute code over an adjacent network.

Products: Windows Reliable Multicast Transport Driver (RMCAST)
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-69789
Confirmed fixed CVEs: Not specified
Updated in this feed: 5 Nov 2026, 10:11 UTC · Revision 1

Source evidence

CVE-2026-69789 Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

official-microsoft-security-updates · Original source

Published 13 Oct 2026, 14:00 UTC

A heap-based buffer overflow in RMCAST allows an unauthorized attacker to execute code over an adjacent network.

Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

Windows Reliable Multicast Transport Driver (RMCAST)

Fixed versions: Not specified

Complete source record

{
  "id": "76b39e16116b090ceff74817857050068c437f7b5547f05fae9859479b9af522",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69789",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-69789 Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability",
    "summary": "A heap-based buffer overflow in RMCAST allows an unauthorized attacker to execute code over an adjacent network.",
    "evidence": "Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.",
    "products": [
      {
        "name": {
          "value": "Windows Reliable Multicast Transport Driver (RMCAST)",
          "evidence": "Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-69789",
        "evidence": "CVE-2026-69789 Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25617,
  "published_at": "2026-10-13T14:00:00+00:00"
}