CVE-2026-83566 | Microsoft Windows up to Server 2025 Win32K use after free

October 14, 2026 Yanac

A vulnerability described as very critical has been identified in Microsoft Windows 11 24H2/11 25H2/11 26H1/11 26H2/Server 2025. This vulnerability affects unknown code of the component Win32K. Such manipulation leads to use after free.

This vulnerability is referenced as CVE-2026-83566. The attack can only be performed from a local environment. No exploit is available.

A patch should be applied to remediate this issue.VulDB Recent EntriesRead More