CVE-2026-62772

Microsoft · Published August 11, 2026

7.8

CVSS v3.1

HIGH

Patch availableGet patch

Description

Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability. Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

Affected Products

Windows 11 version 26H1 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C