July 8, 2025-KB5056580 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2
Applies To
.NETRevised July 7, 2025: Updated 'How to get this update' section.Â
Revised July 10, 2025 : Updated 'How to get this update' section. A known issue section has been added.
Revised July 14, 2025 : Updated the Resolution in the Known Issue section.
IMPORTANT
This update was originally released in the Security and Quality Rollup that’s dated April 22, 2025. This update is included in the Security and Quality Rollup that’s dated July 8, 2025. There is no change to this update with this release on July 8, 2025. If you have previously installed this update no action is needed.
Release Date:July 8, 2025
Version:.NET Framework 3.5 and 4.8.1
The April 22, 2025 update for Windows 11, version 22H2 and Windows 11, version 23H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.
Summary
Security Improvements
There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.
Quality and Reliability Improvements
|
.NET Libraries |
- Addresses an issue with concurrency in TypeDescriptor.GetConverter()issue in TypeDescriptor GetProperties() and GetConverter(). |
|
.NET Runtime |
- Addresses an issue where interactions between .NET Framework DLL loads and OS code integrity enforcement policy trigger error reporting dialog boxes. |
Known issues in this update
|
Symptom |
The Windows 11, version 22H2 package KB5056580 was not available on Windows Server Update Services (WSUS) or Microsoft Update Catalog. It was still available on Windows Update and Microsoft Update. |
|
Workaround |
To work around the issue, the update can be installed through Windows Update and Microsoft Update. See the How to get this update section below for instructions. |
|
Resolution |
The Windows 11, version 22H2 package KB5056580 was published on Windows Server Update Service (WSUS) and Microsoft Update Catalog on July 14th, 2025. |
Note: The Windows 11, version 23H2 package KB5056580 was available on all release channels.
How to get this update
Install this update
|
Release Channel |
Available |
Next Step |
|
Windows Update and Microsoft Update |
Yes |
None. This update will be downloaded and installed automatically from Windows Update. |
|
Windows Update for Business |
Yes |
None. This update will be downloaded and installed automatically from Windows Update. |
|
Microsoft Update Catalog |
Yes |
To get the standalone package for this update, go to the Microsoft Update Catalog website. |
|
Windows Server Update Services (WSUS) |
Yes |
This update will automatically sync with WSUS if you configure Products and Classifications as follows: Product: Windows 11, version 22H2 and Windows 11, version 23H2 Classification: Updates |
File information
For a list of the files that are provided in this update, download the file information for cumulative update.
Prerequisites
To apply this update, you must have .NET Framework 3.5 or 4.8.1 installed.
Restart requirement
You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.
How to obtain help and support for this update
-
Help for installing updates: Windows Update FAQ
-
Protect yourself online and at home: Windows Security support
-
Local support according to your country: International Support
Need more help?
Want more options?
Explore subscription benefits, browse training courses, learn how to secure your device, and more.
Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.
