Windows DHCP Server Denial of Service Vulnerability

Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely CVE-2026-119890 · score 5.3/10

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 Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)

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: KB5131291, KB5131085, KB5131090, KB5131080, KB5131077. Official page.