CVE-2026-40402CWE-416

Windows Hyper-V Elevation of Privilege Vulnerability

Critical · published May 12, 2026

CVSS v3.1

9.3

EPSS

0%

Percentile

29.1

In the wild

Unconfirmed

What it is

Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

The record

Technical detail

CVSS v3.1: 9.3 · CRITICAL
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0: Not supplied
EPSS: 0.00364 · 29.1th percentile
Weakness: CWE-416 · Use After Free
Published: 2026-05-12T16:59Z

EPSS history

Timeline

12 MAY 16:59Z
Windows Hyper-V Elevation of Privilege Vulnerability
cvelistv5