Detections
Analytics

CVE-2026-40402

critical

Description

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

https://thehackernews.com/2026/05/microsoft-patches-138-vulnerabilities.html

Details

Source: Mitre, NVD

Published: 2026-05-12

Updated: 2026-05-13

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9.3

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00044