Windows Server 2019: security updates (KB) and vulnerabilities

3 KB updates fix 15 tracked CVEs for Windows Server 2019.

Windows Server 2019 has 15 tracked vulnerabilities, 0 critical and 1 exploited in the wild (CISA KEV). A fixed release or vendor patch exists for 15. Most recent: 2026-10-13. Highest priority: CVE-2026-85880 (score 80/100).

• CVE-2026-85880 HIGH 7.8 EXPLOITED UPGRADE UPGRADE Microsoft Windows Heap-Based Buffer Overflow Vulnerability
• CVE-2026-49179 HIGH 8.8 UPGRADE UPGRADE Improper neutralization of special elements used in a command ('command injection') in Windows Active Director
• CVE-2026-62785 HIGH 8.8 UPGRADE UPGRADE Heap-based buffer overflow in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized atta
• CVE-2026-62795 HIGH 8.8 UPGRADE UPGRADE Use after free in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to exec
• CVE-2026-69326 HIGH 8.8 UPGRADE UPGRADE Heap-based buffer overflow in Graphic Fonts allows an unauthorized attacker to execute code over a network.
• CVE-2026-69521 HIGH 8.8 UPGRADE UPGRADE Integer overflow or wraparound in Windows iSCSI allows an unauthorized attacker to execute code over a network
• CVE-2026-96222 HIGH 7.4 UPGRADE UPGRADE Improper certificate validation in Active Directory Federation Services (AD FS) allows an unauthorized attacke
• CVE-2026-69363 HIGH 8.0 UPGRADE UPGRADE Heap-based buffer overflow in Windows Error Reporting allows an authorized attacker to elevate privileges over
• CVE-2026-83862 HIGH 8.8 UPGRADE UPGRADE Use after free in Windows Network Load Balancing allows an unauthorized attacker to execute code over an adjac
• CVE-2026-69452 HIGH 7.1 UPGRADE UPGRADE Use after free in Windows Enterprise App Management allows an authorized attacker to elevate privileges over a
• CVE-2026-68836 HIGH 7.8 UPGRADE UPGRADE Heap-based buffer overflow in Windows kernel32.dll allows an authorized attacker to elevate privileges locally
• CVE-2026-69354 HIGH 7.8 UPGRADE UPGRADE Heap-based buffer overflow in Windows Error Reporting allows an authorized attacker to elevate privileges loca
• CVE-2026-69471 HIGH 7.8 UPGRADE UPGRADE Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.
• CVE-2026-69387 HIGH 7.0 UPGRADE UPGRADE Use after free in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
• CVE-2026-108396 HIGH 7.0 UPGRADE UPGRADE Time-of-check time-of-use (toctou) race condition in Windows Modern Device Management (MDM) allows an authoriz

FAQ

How do I fix Windows Server 2019 vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is Windows Server 2019 being exploited right now?

Yes: 1 Windows Server 2019 CVE is on the CISA Known Exploited Vulnerabilities list, so patch it first.

Which Windows Server 2019 CVE should I patch first?

CVE-2026-85880 currently ranks highest (80/100): Microsoft Windows Heap-Based Buffer Overflow Vulnerability.

Security updates (KB) for Windows Server 2019

Install the KB from Windows Update, then verify with Get-HotFix -Id KBxxxxxxx or winver. Fixed build is the OS build number after the update.

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