Applies To
Windows Server 2019 Win 10 Ent LTSC 2019

Release Date:

12/9/2025

Version:

OS Build 17763.8146

Windows Secure Boot certificate expiration 

Important: 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.

Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.

Support for Windows Server 2019 will end in January 2029

After January 9, 2029, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows Server 2019. We recommend that you upgrade to a later version of Windows Server.

Change date

Change description

December 12, 2025

  • Added the "Message Queuing (MSMQ)" known issue.

Summary

Applies to: Windows Server 2019

This security update includes fixes and quality improvements that are part of the following update:

The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the December 2025 Security Updates.

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 1809, see its update history page.

Known issues in this update​​​​​​​

Symptoms

After installing this update, users might face issues with the Message Queuing (MSMQ) functionality. This issue also impacts clustered MSMQ environments under load. Due to this issue, users might encounter the following symptoms:

  • MSMQ queues becoming inactive

  • IIS sites failing with “Insufficient resources to perform operation” errors

  • Applications unable to write to queues

  • Errors such as "The message file 'C:\Windows\System32\msmq\storage*.mq' cannot be created” when creating message files

  • Misleading logs, such as “There is insufficient disk space or memory", despite sufficient disk space and memory being available

This issue is caused by the recent changes introduced to the MSMQ security model and NTFS permissions on the C:\Windows\System32\MSMQ\storage folder. MSMQ users now require write access to this folder, which is normally restricted to administrators. As a result, attempts to send messages via MSMQ APIs might fail with resource errors.

Individuals using Windows Home or Pro editions on personal devices are very unlikely to experience this issue. This issue primarily affects enterprise or managed IT environments. 

Microsoft Support: A workaround is available for affected devices. To apply the workaround and mitigate this issue in your organization, please contact Microsoft Support for business.

Next step

The issue is under investigation, and additional information will be shared as soon as it becomes available.

Servicing stack update (KB5070248) - 17763.8020

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing updates.

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. To learn more about SSUs, see Servicing stack updates, Servicing Stack Updates (SSU), Frequently Asked Questions, and Simplifying on-premises deployment of servicing stack updates.

How to get this update

Before you install this update

You must have installed the August 10, 2021 SSU (KB5005112) before installing this cumulative update.

Install this update

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

Available

Next Step

Available

This update will be downloaded and installed automatically from Windows Update and Microsoft Update.

If you want to remove the LCU

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File information

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Download IconDownload the file information for this cumulative update KB5071544 now.

Download IconDownload the file information for the SSU (KB5070248) - version 17763.8020 update now.

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