Use after free in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
Fix
Microsoft's update · Critical
- KB5126835 — Windows Server 2012, Windows Server 2012 (Server Core installation) · build 6.2.9200.26434 · restart required
- KB5126836 — Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) · build 6.3.9600.23470 · restart required
- KB5126868 — Windows Server 2016, Windows Server 2016 (Server Core installation) · build 10.0.14393.9612 · restart required
- KB5126651 — Windows Server 2019, Windows Server 2019 (Server Core installation) · build 10.0.17763.9376 · restart required
- KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
- KB5126646 — Windows Server 2025, Windows Server 2025 (Server Core installation) · build 10.0.26100.33650 · restart required
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.
Patch, vendor advisory and mitigation references on NVD 1
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 4
- Cpes+6 CPE criteria (now 6)NVD modified 2026-10-28 16:46
- StatusPublished → AnalyzedNVD modified 2026-10-28 16:46
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:40
- First seenCVSS 8.1NVD modified 2026-10-13 21:19
Affected (CPE criteria) 6
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*