CVE-2026-33840: Microsoft Windows 11 24h2

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft Windows 11 24h2: before 10.0.26100.8390 (fixed in 10.0.26100.8390)
• Microsoft Windows 11 25h2: before 10.0.26200.8390 (fixed in 10.0.26200.8390)
• Microsoft Windows 11 26h1: before 10.0.28000.2113 (fixed in 10.0.28000.2113)
• Microsoft Windows Server 2025: before 10.0.26100.32772 (fixed in 10.0.26100.32772)

Published 2026-05-12. Last modified 2026-06-17.