CVE-2026-27931: Microsoft Windows 10 21h2

Medium severity, CVSS 5.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Out-of-bounds read in Windows GDI allows an unauthorized attacker to disclose information locally.

Affected products

• Microsoft Windows 10 21h2: before 10.0.19044.7184 (fixed in 10.0.19044.7184)
• Microsoft Windows 10 22h2: before 10.0.19045.7184 (fixed in 10.0.19045.7184)
• Microsoft Windows 11 23h2: before 10.0.22631.6936 (fixed in 10.0.22631.6936)
• Microsoft Windows 11 24h2: before 10.0.26100.8246 (fixed in 10.0.26100.8246)
• Microsoft Windows 11 25h2: before 10.0.26200.8246 (fixed in 10.0.26200.8246)
• Microsoft Windows 11 26h1: before 10.0.28000.1836 (fixed in 10.0.28000.1836)
• Microsoft Windows Server 2022: before 10.0.20348.5020 (fixed in 10.0.20348.5020)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.2274 (fixed in 10.0.25398.2274)
• Microsoft Windows Server 2025: before 10.0.26100.32690 (fixed in 10.0.26100.32690)

Published 2026-04-14. Last modified 2026-06-17.