Windows releases / KB5126646 KB5126646 B
Released in the last few days. Start with a pilot ring while early reports come in.
ChangeIntel's reading of public signals, not advice; check Microsoft's guidance and test before you deploy. Terms
Urgency Unknown · evidence incompleteRisk Unknown · evidence incomplete
Released today Some required public sources could not be fully read. The assessment may be missing issues or security fixes.
From Microsoft's release-information tables
Servicing branch OS build Release Available Windows Server 2025
26100.33650
B 2026-10 B 13 Oct 2026
Compiled from public sources. Versions and builds come from Microsoft's release-information tables, security fixes from MSRC CVRF documents, and known issues from Windows release health. The support article has the full change list, prerequisites, and removal instructions. Nothing here says whether your devices installed this update.