This vulnerability involves an integer overflow or wraparound in the Windows DWM Core Library, leading to a heap-based buffer overflow. The flaw allows an attacker with local authorized access to elevate their privileges on the affected system. The issue affects Windows 10 Version 1607, specifically build 10.0.14393.0. Microsoft has released an official fix for this vulnerability.

Successful exploitation of this vulnerability could allow a local attacker with authorized access to elevate their privileges, potentially gaining higher-level permissions on the affected system. The CVSS v3.1 base score is 7.8, indicating high severity with high impact on confidentiality, integrity, and availability.

An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34336 to remediate this vulnerability.