CVE-2026-69447: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 version 23H2

This vulnerability (CVE-2026-69447) involves a heap-based buffer overflow in the Windows Audio Service component of Microsoft Windows 11 version 23H2. An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The flaw is classified under CWE-122 (Heap-based Buffer Overflow). The vulnerability affects multiple builds of Windows 11 version 23H2 as specified by the affected version ranges. Microsoft has published an official fix to address this issue.

Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially gaining higher-level access than intended. This can lead to full system compromise depending on the privileges escalated to. The vulnerability impacts confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H).

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for Windows 11 version 23H2 as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69447. Applying the patch fully mitigates the vulnerability.