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CVE-2026-21244

HighPublished

Windows Hyper-V Remote Code Execution Vulnerability

Published: Feb 10, 2026
Updated: Aug 19, 2026
Assigning CNA: microsoft
Evidence observed: Apr 30, 2026

Primary CVSS

7.3/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

1.3%

Low · next 30 days

Percentile: 68.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

Sources

Windows 11 25H2 - Heap OverflowExploit
nu11secur1ty · windows · Apr 30, 2026

Responsible use

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