.NET Denial of Service Vulnerability
CVE-2026-120796
Summary
Missing release of memory after effective lifetime in Windows DNS allows an unauthorized attacker to deny service over a network.
Products covered
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 26H2 for x64-based Systems
Windows 11 Version 26H2 for ARM64-based Systems
Show 4 more products
Windows Server 2025
Windows Server 2025 (Server Core installation)
Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Remediation
Install KB5131087. Install KB5132061. Install KB5132043. Install KB5131080. Install KB5131077. Install KB5132059.
Vendor-listed fixes
10.0.22631.7711
10.0.26100.9974
10.0.26100.9911
10.0.26200.9974
10.0.26200.9911
10.0.26300.9974
10.0.26300.9911
10.0.26100.33822
Show 2 more fixes
10.0.26100.33730
10.0.28000.3501
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.