Microsoft Windows 11 26H1 Update Version OS Build 28000.3237; AI components 1.2608.951.0

KB5134134 is a non-security out-of-band cumulative update for Windows 11 version 26H1. It adds updated trusted root certificate data for devices that cannot receive automatic certificate trust list updates.

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Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 26H1

Version: OS Build 28000.3237; AI components 1.2608.951.0

Vendor information published: Oct 26, 2026

Original release notes: View on vendor site

Published on updatealert.io: Oct 30, 2026

Description: Client operating system for modern desktop and enterprise environments.