Microsoft has just released an emergency out-of-band (OOB) update

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 Microsoft has just released an emergency out-of-band (OOB) update for Windows 11 to fix critical issues introduced in the October 2025 Patch Tuesday update (KB5066835). Here's what you need to know:

 What Went Wrong

• Broken Localhost Connections: The update disrupted HTTP/2 connections to , affecting developers and apps relying on local servers like IIS and ASP.NET.

• WinRE Failure: USB keyboards and mice stopped working in the Windows Recovery Environment (WinRE), leaving users unable to troubleshoot or recover their systems.

• Peripheral Issues: Logitech devices and File Explorer previews were also affected.

 Emergency Fix: KB5070773

Microsoft has issued KB5070773 to resolve these problems:

• Restores USB functionality in WinRE for Windows 11 versions 24H2 and 25H2.

• Fixes the localhost regression caused by HTTP.sys mishandling HTTP/2 handshakes.

 How to Get the Update

• Automatic Installation: The update is rolling out via Windows Update and will install automatically for most users.

• Manual Option: If it doesn’t appear, you can download it from the Microsoft Update Catalog.

 Additional Server Patch

Microsoft also released emergency patches (KB5070881, KB5070879, KB5070884) for Windows Server to address a remote code execution vulnerability (CVE-2025-59287) in WSUS.


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