.NET Denial of Service Vulnerability
CVE-2026-120796
Summary
Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
Products covered
Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows Server 2025
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Remediation
Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5089548.
Vendor-listed fixes
10.0.26100.32860
10.0.26100.32772
10.0.26200.8457
10.0.26200.8390
10.0.26100.8457
10.0.26100.8390
10.0.28000.2113
CVEs in this advisory 1
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Added to SecurityAlert
We collected the advisory from the official source.
- Confirmed at the source
Our collector saw this advisory during a later source check.