CVE-2026-41089: Microsoft Windows Server 2012

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft Windows Server 2012: affected versions not specified; version r2 only
• Microsoft Windows Server 2016: before 10.0.14393.9140 (fixed in 10.0.14393.9140)
• Microsoft Windows Server 2019: before 10.0.17763.8755 (fixed in 10.0.17763.8755)
• Microsoft Windows Server 2022: before 10.0.20348.5074 (fixed in 10.0.20348.5074)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.2330 (fixed in 10.0.25398.2330)
• Microsoft Windows Server 2025: before 10.0.26100.32772 (fixed in 10.0.26100.32772)

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