Privilege escalation via stack overflow

Stack-based buffer overflow in Windows Installer in Microsoft Windows allows local users to gain elevated privileges via installer operations. Microsoft has not disclosed the affected function or code path, so the public record does not reveal which Windows Installer operation copies or parses attacker-controlled data into a fixed-size stack buffer. Exploitation requires local authenticated execution with low privileges and yields local privilege escalation, with no public evidence of remote reachability or in-the-wild exploitation as of August 19, 2026.