This Hotpatch update for Windows 11, version 26H2, 25H2 and 24H2 (KB5132043) includes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates.
To view the latest updates about this release, visit the Windows release health dashboard or the update history page for Windows 11, version 26H2, 25H2 and 24H2.
Announcements and messages
This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.
Windows Secure Boot certificate expiration
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start and operate normally, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
You can check your PC status on the Windows Security app. If you are an IT administrator, follow the guidance on the Secure Boot Playbook for Windows clients and Windows Server.
Improvements and fixes
This security update includes quality improvements.
The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change.
- [Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
Servicing Stack Update (KB5132688) - 26100.9971
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the Hotpatch update. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Servicing stack updates.
How to get this update
Before you install this update
Baseline: You must have baseline KB5127648 installed before installing this update.
Servicing Stack Update (SSU): You must have installed servicing stack update version 26100.9703 or later before installing this update. To determine the latest SSU installed on your device, run DISM /Online /Get-Packages | findstr /i "ServicingStack" from an elevated command prompt. The Package Identity line returned must be version 26100.9703 or later.
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.
| Release Channels |
Available |
Next step |
| Windows Update |
|
This update downloads and installs automatically from Windows update. |
| Microsoft Update Catalog |
|
See the other options. |
| Windows Server Update Services |
|
See the other options. |
A list of the files included in this update is provided in a CSV (comma-delimited) (.csv) file. You can open the file in a text editor, such as Notepad, or in Microsoft Excel.
Note: The English (United States) version of this software update might contain files for additional languages.
Download the file information for cumulative update KB5132043.
Download the file information for the SSU KB5132688 - version 26100.9971.
Note
Hotpatch is now generally available for Windows 11, version 25H2 and 24H2 (Arm64) devices. To get started, check the prerequisites, disable Compiled Hybrid PE (CHPE), and enroll the devices in a quality update policy with Hotpatch enabled. For more information, see prerequisites.
The following summary outlines key issues addressed by this update. The bold text within the brackets indicates the item or area of the change.
- [Security updates] This update provides security improvements. For more information about the security vulnerabilities resolved by this update, see the Security Update Guide.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
Servicing Stack Update (KB5132688) - 26100.9971
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the Hotpatch update. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Servicing stack updates.
How to get this update
Before you install this update
Baseline: You must have baseline KB5127648 installed before installing this update.
Servicing Stack Update (SSU): You must have installed servicing stack update version 26100.9703 or later before installing this update. To determine the latest SSU installed on your device, run DISM /Online /Get-Packages | findstr /i "ServicingStack" from an elevated command prompt. The Package Identity line returned must be version 26100.9703 or later.
If you are using Windows Update, the latest SSU installs with this update.
Prerequisites: Get your Arm64 device hotpatch ready
To use Hotpatch updates, your device must meet the following requirements:
For more information, see Hotpatch prerequisites.
One-time setup: Disable CHPE to enable Hotpatch on Arm64
To enable hotpatching on Arm64 devices, you must also disable CHPE. CHPE is a compatibility layer that's not compatible with Hotpatch updates.
Use the DisableCHPE policy. Apply the following configuration service provider (CSP) setting via Microsoft Intune or Group Policy, then restart the device once. Learn more at System Policy CSP.
./Device/Vendor/MSFT/Policy/Config/Hotpatch/DisableCHPE = 1
Use registry keys. You can also set the following registry key value to 1, then restart the device once.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\HotPatchRestrictions = 1
Your ARM64 devices are now Hotpatch ready! For more information, see DisableCHPE.
Enroll Arm64 devices to receive Hotpatch updates
To enroll devices to receive Hotpatch updates:
- Go to the Microsoft Intune admin center.
- Navigate to Devices > Windows updates > Quality updates.
- If you're creating a new policy, select Create Windows quality update policy. To edit an existing policy, select it from the list under Name. On the following screen, select Edit next to Settings.
- Next to Automatic update deployment settings, ensure that the option “When available, apply without restarting the device” is set to Allow.
- Assign the policy to your Arm64 device group.
See the full guide at Enroll devices to receive Hotpatch updates.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
| Release Channels |
Available |
Next step |
| Windows Update |
|
This update downloads and installs automatically from Windows update. |
| Microsoft Update Catalog |
|
See the other options. |
| Windows Server Update Services |
|
See the other options. |
A list of the files included in this update is provided in a CSV (comma-delimited) (.csv) file. You can open the file in a text editor, such as Notepad, or in Microsoft Excel.
Note: The English (United States) version of this software update might contain files for additional languages.
Download the file information for cumulative update KB5132043.
Download the file information for the SSU KB5132688 - version 26100.9971.
