Applies To
Windows Server 2025 Datacenter: Azure Edition

Release Date:

8/12/2025

Version:

OS Build 26100.4851

Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.

Note: Windows Server 2025 Datacenter & Standard machines connected to Azure Arc, now have the option to subscribe to hotpatch servicing. Hotpatch provides the ability to install OS security updates without restarting your machine. 

This update applies to Windows Server 2025 Datacenter & Standard machines that are connected to Azure Arc. To learn more about Windows update terminology, see types of Windows updates and the monthly quality update types. For an overview, see the update history page for Windows Server 2025.   

Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release health dashboard.

Improvements and fixes

This security update includes quality improvements. The following summary outlines key issues addressed by the KB update after you install it.

  • This update makes miscellaneous security improvements to internal OS functionality. There are no additional issues documented in this release.

If you installed earlier updates, your device downloads and installs only the new updates contained in this package.

How to get this update 

Before you install this update 

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the hotpatch update. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU installs with this update.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.

Available

Next Step

Included

This update downloads and installs automatically from Windows update and Microsoft Update.

File information

For a list of the files provided in this update, download the file information for cumulative update 5064010.

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5065381) - version 26100.4933.

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