CVE-2026-33840

HIGH

Windows 11 24H2-26H1 and Windows Server 2025 - Use-After-Free in Win32K ICOMP

Title source: llm
STIX 2.1

Description

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Win32k Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33840

Scores

CVSS v3 7.8
EPSS 0.0007
EPSS Percentile 20.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (9)
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8457
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8457
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2113
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32860
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32860
microsoft/windows_11_24h2 < 10.0.26100.8390 (2 CPE variants)
microsoft/windows_11_25h2 < 10.0.26200.8390 (2 CPE variants)
microsoft/windows_11_26h1 < 10.0.28000.2113 (2 CPE variants)
microsoft/windows_server_2025 < 10.0.26100.32772
Published May 12, 2026
Tracked Since May 12, 2026