CVE-2026-41089 — Microsoft Windows Netlogon BuildSamLogonResponse Stack-based Buffer Overflow RCE
Section 1: Overview A stack-based buffer overflow vulnerability exists in the Windows Netlogon service’s DC locator ping response handler. When a domain controller processes a CLDAP search request, it serializes response data including attacker-supplied and server-side strings into a fixed-size stack buffer without adequate bounds checking. An unauthenticated remote attacker can send a single crafted CLDAP packet to a domain controller’s UDP port 389, causing the Netlogon service to crash the LSASS process and force the domain controller to reboot. The exploitability depends on the target domain controller’s DNS naming configuration — domain controllers with longer DNS domain names and hostnames are vulnerable. Microsoft addressed this vulnerability in the May 2026 security update. ...