Microsoft Defender Remote Code Execution Vulnerability

Summary

Null pointer dereference in Microsoft Defender allows an unauthorized attacker to execute code over a network.

Products covered

• Microsoft Malware Protection Engine

Remediation

Release Notes

Vendor-listed fixes

• 1.1.26100.4

CVEs in this advisory 1

CVE-2026-122194

Updates

1. Nov 10, 2026 at 8:00 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Nov 10, 2026 at 8:15 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.