CVE-2026-21244: Windows Hyper-V Remote Code Execution Vulnerability
Published Feb 10, 2026
·Updated
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Other sources
Windows Hyper-V Remote Code Execution Vulnerability
— Microsoft
Affected Software
36 affected componentsFixes available
Microsoft Windows Server 2016
Microsoft Windows Server 2025
Microsoft Windows 10=1607
Microsoft Windows 11=23H2
Microsoft Windows 11=23H2
Microsoft Windows Server 2016
Microsoft Windows 11=25H2
Microsoft Windows Server 2022, 23H2 Edition
Microsoft Windows 11=24H2
Microsoft Windows 11=24H2
Microsoft Windows 11=25H2
Microsoft Windows Server 2022
Microsoft Windows Server 2025
Microsoft Windows 10=21H2
Microsoft Windows 10=22H2
Microsoft Windows Server 2022
Microsoft Windows 10=1809
Microsoft Windows 11=26H1
Microsoft Windows 11=26H1
Microsoft Windows Server 2019
Microsoft Windows Server 2019
Microsoft Windows 10 1607<10.0.14393.8868
Microsoft Windows 10 1809<10.0.17763.8389
Microsoft Windows 10 21h2<10.0.19044.6937
Microsoft Windows 10 22h2<10.0.19045.6937
Microsoft Windows 11 23h2<10.0.22631.6649
Microsoft Windows 11 23h2<10.0.22631.6649
Microsoft Windows 11 24h2<10.0.26100.7781
Microsoft Windows 11 24h2<10.0.26100.7781
Microsoft Windows 11 25h2<10.0.26200.7781
Microsoft Windows 11 25h2<10.0.26200.7781
Microsoft Windows Server 2016<10.0.14393.8868
Microsoft Windows Server 2019<10.0.17763.8389
Microsoft Windows Server 2022<10.0.20348.4711
Microsoft Windows Server 2022 23h2<10.0.25398.2149
Microsoft Windows Server 2025<10.0.26100.32313
Event History
Feb 10, 2026
CVE Published
via Microsoft·04:00 PM
Data Sourced
via Microsoft·04:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·04:00 PM
Affected Software
Updated
via Microsoft·04:00 PM
Description
CVE Published
via MITRE·05:51 PM
Data Sourced
via MITRE·05:51 PM
DescriptionSeverity
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
Apr 30, 2026
Exploit Published
via ExploitDB·12:00 AM
Known Exploited
08:42 AM
Frequently Asked Questions
1
What is the severity of CVE-2026-21244?
CVE-2026-21244 is rated as a critical severity vulnerability with potential for remote code execution.
2
How do I fix CVE-2026-21244?
To fix CVE-2026-21244, apply the latest security patches provided by Microsoft for your affected Windows products.
3
What systems are affected by CVE-2026-21244?
CVE-2026-21244 affects various versions of Windows Server and Windows 10/11 products, including specific builds.
4
What type of vulnerability is CVE-2026-21244?
CVE-2026-21244 is a heap-based buffer overflow vulnerability within Windows Hyper-V.
5
Can CVE-2026-21244 be exploited remotely?
Yes, CVE-2026-21244 can potentially be exploited by an authorized attacker to execute code locally.