Use-after-free in Microsoft Windows and Windows Server - CVE-2026-65776
Published: August 12, 2026
Vulnerability identifier: #VU141968
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-65776
CWE-ID: CWE-416
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 use-after-free in Windows Win32K when handling crafted local operations. A local user can trigger a race condition to escalate privileges.
Successful exploitation requires winning a race condition. An attacker who successfully exploits the issue could gain SYSTEM privileges.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-65776
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9106, 11 24H2 10.0.26100.9168, 11 25H2 10.0.26200.9168, 11 26H1 10.0.28000.2704
Windows Server - addressed in versions 2025 10.0.26100.33222, 2025 10.0.26100.33296
Windows Server - addressed in versions 2025 10.0.26100.33222, 2025 10.0.26100.33296