CVE-2026-78445: Microsoft Windows Server 2012

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

Use after free in Windows Services for NFS ONCRPC XDR Driver 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 10.0.14393.9512 (fixed in 10.0.14393.9512)
• Microsoft Windows Server 2019: before 10.0.17763.9245 (fixed in 10.0.17763.9245)
• Microsoft Windows Server 2022: before 10.0.20348.5622 (fixed in 10.0.20348.5622)
• Microsoft Windows Server 2025: before 10.0.26100.33438 (fixed in 10.0.26100.33438)

Published 2026-09-08. Last modified 2026-09-24.