KB5134133: Overview with user sentiment and feedback

Overview

KB5134133 is an out-of-band, non-security cumulative update released October 26, 2026 for Windows 11 versions 24H2, 25H2, and 26H2 (builds 26100.9725, 26200.9725, 26300.9725). It is aimed mainly at devices that cannot receive automatic certificate trust list (CTL) updates, such as disconnected or CTL-disabled machines. It also includes the SSU KB5127647 and AI component updates for Copilot+ PCs.

General Purpose

• Ships an updated trusted root certificate payload for devices that cannot get CTL updates, including eMudhra-related trust changes.
• Rolls up fixes from the October 13, 2026 update (KB5127648).
• Includes servicing stack update KB5127647 (build 26100.9703) for more reliable update installation.
• Updates AI components (Image Search, Content Extraction, Semantic Analysis, Settings Model) to 1.2608.951.0 on Copilot+ PCs.
• Devices enrolled in hotpatch will not receive hotpatch updates until after the January 2027 baseline is installed.

General Sentiment

No substantive community discussion was available in the provided data, so reception cannot be gauged. Microsoft's own notes flag open issues with this build, which warrant caution despite the update's narrow intended audience.

Known Issues

• Smart App Control may be grayed out and unable to be re-enabled on devices where it was turned off (registry or Group Policy workaround available).
• Non-admin Remote Desktop connections may fail with 0xC000000D to hosts with Administrator protection enabled (carried over from KB5124010).
• USB Audio Class 1.0 devices may fail to start or produce no sound (carried over from KB5124012; partially fixed by KB5129195).

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-28 12:52 PM

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