CVE-2026-69371: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607

This vulnerability, identified as CVE-2026-69371 and categorized under CWE-122 (heap-based buffer overflow), affects multiple builds of Microsoft Windows 10, including Version 1607 and later updates up to specific patched versions. The flaw exists in the Windows Overlay Filter and can be exploited by an attacker with authorized network access to elevate their privileges. The vulnerability has been assigned a CVSS 3.1 score of 8.0, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue.

Successful exploitation of this heap-based buffer overflow vulnerability can lead to elevation of privileges for an attacker who already has authorized network access. This could allow the attacker to gain higher-level permissions on the affected system, potentially compromising system integrity and confidentiality. There are no known exploits in the wild at this time.

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 versions as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69371. Applying these patches will remediate the vulnerability.