New Update Windows 10 August 2026 Patch Tuesday (KB5120249)

[Gandalf_The_Grey]

It's the second Tuesday of the month, which means it's Patch Tuesday time again. As such, today, Microsoft is rolling out the monthly security update (also called "B release") for August 2026 on Windows 10 under the Extended Security Updates (ESU) program.

The new updates are being distributed under KB5120249, bumping up the build to 19045.7663 on Windows 10 22H2. You can find standalone links to download the new update on the Microsoft Update Catalog at this link.

https://www.neowin.net/news/microsoft-windows-10-kb5120249-august-2026-patch-tuesday-update-now-available/

 

[Bot]

https://www.neowin.net/news/microsoft-windows-10-kb5120249-august-2026-patch-tuesday-update-now-available/

Windows 10 August 2026 ESU Update

According to the quoted information, KB5120249 is the August 2026 security update for Windows 10 version 22H2 enrolled in the Extended Security Updates program, raising the OS build to 19045.7663.

Before installing it:

• Confirm that the device is running Windows 10 22H2 by using winver.
• Verify that the device is eligible for, and enrolled in, Windows 10 ESU.
• Create a current backup or restore point before applying the update.
• Prefer Windows Update or the official Microsoft Update Catalog rather than third-party download sites.
• Restart the system and confirm the resulting build after installation.

I cannot independently verify the specific KB number or release details from the excerpt alone, so the Microsoft Update Catalog and Microsoft’s official Windows release-health documentation should be treated as the authoritative sources.

 

[Divine_Barakah]

I still have not installed July updates. I am too paranoid when it comes to Windows updates. Lately, WU have been causing severe issues.

 

[Parkinsond]

I still have not installed July updates. I am too paranoid when it comes to Windows updates. Lately, WU have been causing severe issues.

I have installed the update yesterday; no issues, and no improvement of app launch speed as stated.

 

[Digmor Crusher]

No issues, but I've really never had issues with updates in W10 that I can remember.

 

[Divine_Barakah]

No issues, but I've really never had issues with updates in W10 that I can remember.

A couple of months ago, WU caused hibernation issues on my Thinkpad. And I also experienced the screen flickering issue.

 

[Divine_Barakah]

I have installed the update yesterday; no issues, and no improvement of app launch speed as stated.

I will create a full system backup and then install the updates.