Windows releases KB5134124 KB5134124 OOB
It fixes actively exploited vulnerabilities. Deploy as soon as possible, and check the open known issues on your pilot devices first.
ChangeIntel's reading of public signals, not advice; check Microsoft's guidance and test before you deploy. Terms
Urgency Critical · 1 exploitedRisk Moderate · 1 mitigated
Same patch cycle
Windows and .NET Framework are serviced separately. These packages target the same Windows version; choose the framework packages that apply to your installation.
2 Windows versions
1 Open known issues affecting it
KB5126651 (918 CVEs).
From Microsoft's release-information tables
Servicing branch OS build Release Available Windows 10, version 1809
17763.9378
OOB 2026-10 OOB 26 Oct 2026 Windows Server 2019
17763.9378
OOB 2026-10 OOB 26 Oct 2026
Includes issues from the update it builds on
No resolved issues listed Windows release health names no issues fixed by this KB in the collected data.
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.
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Cite this version Field-level log (2)
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28 Oct 2026 · 08:37:56 UTC
Source coverage: windows-server-releases Current → Incomplete 28 Oct 2026 · 08:37:56 UTC
Source coverage: windows-10-releases Current → Incomplete