CVE-2026-69720: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 Version 24H2

This vulnerability (CVE-2026-69720) involves a heap-based buffer overflow in the Windows MIDI Service Module in Windows 11 Version 24H2. An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The issue affects specific builds of Windows 11 Version 24H2, namely versions from 10.0.26100.0 up to but not including 10.0.26100.9445, 10.0.26200.0 up to but not including 10.0.26200.9445, and 10.0.28000.0 up to but not including 10.0.28000.2954. Microsoft has published an official fix to address this vulnerability.

Successful exploitation of this heap-based buffer overflow can lead to local privilege escalation, allowing an attacker with authorized local access to gain higher privileges on the affected system. This could enable the attacker to execute code with elevated rights, potentially compromising system integrity and confidentiality.

An official fix is available from Microsoft. It is recommended to apply the security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69720. No additional mitigation steps are indicated by the vendor advisory.