CVE-2026-21244

HIGH

Windows Hyper-V - Buffer Overflow

Title source: llm

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

CVSS v3 7.3

EPSS 0.0002

EPSS Percentile 5.2%

Attack Vector LOCAL

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

CWE

CWE-122 CWE-787

Status published

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_24h2 < 10.0.26100.7781

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

Published Feb 10, 2026

Tracked Since Feb 18, 2026