Windows Active Directory Denial of Service Vulnerability

Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely CVE-2026-105559 · score 6.5/10

What could go wrong?

An attacker could make a program or service crash or stop responding.

How urgent is it?

Check Microsoft’s page for details.

Who is affected?

Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation) and 20 more versions

What should I do?

Install this month’s updates via Windows Update, Intune or your update tool, then restart.

Known problems

Microsoft lists known issues per update: KB5132061, KB5132043, KB5131085, KB5131090, KB5131096, KB5131080. Official page.