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CVE-2026-83895 is a heap-based buffer overflow vulnerability in the Windows Win32 Kernel Subsystem affecting multiple builds of Windows 10 Version 1809 and later. This flaw allows an unauthorized attacker with physical access to the machine to elevate privileges. The vulnerability has a CVSS score of 6.8 (medium severity). An official fix is available from Microsoft.

This vulnerability involves a heap-based buffer overflow in the Windows Win32 Kernel Subsystem, which can be exploited by an attacker with physical access to elevate privileges on affected Windows 10 systems. Multiple specific Windows 10 builds are affected, with versions ranging from 10.0.17763.0 up to but excluding various patch levels. The vulnerability is tracked as CVE-2026-83895 and is assigned CWE-122. Microsoft has published an official fix for this issue.

CVE-2026-83895 is a heap-based buffer overflow vulnerability in the Windows Win32 Kernel Subsystem affecting multiple builds of Windows 10 Version 1809 and later. This flaw allows an unauthorized attacker with physical access to the machine to elevate privileges. The vulnerability has a CVSS score o

CVE-2026-83895: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1809

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