Heap-based buffer overflow in Microsoft Windows - CVE-2026-62772
Published: August 12, 2026
Vulnerability identifier: #VU141769
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62772
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) when handling local operations. A local user can trigger the flaw to escalate privileges.
Successful exploitation could allow an attacker to gain SYSTEM privileges.
Affected software
Microsoft Windows
How to mitigate CVE-2026-62772
Install security update from vendor's website.
Microsoft Windows - update to 11 26H1 10.0.28000.2704