Use-after-free in Microsoft Windows and Windows Server - CVE-2026-40402
Published: May 13, 2026
Vulnerability identifier: #VU131291
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-40402
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in Windows Hyper-V. A local attacker can gain elevated privileges on the system.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-40402
Install updates from vendor's website.
Microsoft Windows - addressed in versions 11 23H2 10.0.22631.7079, 11 25H2 10.0.26200.8390
Windows Server - addressed in versions 2022 10.0.20348.5074, 2022 10.0.20348.5139, 2025 10.0.26100.32772
Windows Server - addressed in versions 2022 10.0.20348.5074, 2022 10.0.20348.5139, 2025 10.0.26100.32772