Windows Active Directory Domain Services Remote Code Execution Vulnerability

Summary

Heap-based buffer overflow in Active Directory Domain Services allows an unauthorized attacker to execute code over a network. Published in July 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-49164. Confirm whether Active Directory Domain Services is deployed, then apply the current security update or documented mitigation. CVSS score: 8.1.

Sources