The Update BureauKB5042056: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows 10 21H2/22H2, August 2024. Visual Studio build conflicts and WebForms metadata issues addressed
Addresses .NET reliability issues involving zlib, UI automation, serialization, ASP.NET WebForms, and Visual Studio compilation. It adds no new security improvements.
Does it affect you? Applies to: Devices running Windows 10, version 21H2 or 22H2, with .NET Framework 3.5 or 4.8 installed. This includes Windows 10 Enterprise LTSC 2021.
What changes
Fixes 5 changes
.NET Libraries
- The update addresses an issue with updating the zlib file to its latest version.1
.NET Fundamentals
- The update addresses an issue affecting the rendering of UI automation ListView sub-items.2
- The update addresses an issue where BinaryFormatter mutations could bypass the serialization binder.3
- The update addresses an issue with ASP.NET WebForms SmartNavigation meta tags referencing the Recreational Software Advisory Council and the content-rating schema.4
-
The update addresses Visual Studio compilation conflicts that could slow development on large ASP.NET projects.5
The issue involves conflicts between design-time and debug/runtime compilation of some .NET Framework ASP.NET projects.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2024-08-13
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5037592
- Replaced by
- KB5044020
| Version | File version | Channel |
|---|---|---|
| 3.5 | 2.0.50727.9179 | General availability |
| 4.8 | 4.8.4744.0 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
Updated components
106 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| WPF | 33 |
| .NET runtime (CLR) | 21 |
| ASP.NET | 15 |
Verified in package: changed files confirm .NET Fundamentals.
Sources
Cited passages from Microsoft's official notes (5)
-
1.
Addresses an issue to update zlib file to latest version.
support.microsoft.com -
2.
Addresses an issue to render UI automation ListView sub items.
support.microsoft.com -
3.
Addresses an issue with bypass serialization binder with binary formatter mutations.
support.microsoft.com -
4.
Addresses an issue to remove meta tag information referencing "Recreational Software Advisory Council" and the content-rating schema from ASP.Net WebForms SmartNavigation feature.
support.microsoft.com -
5.
Addresses an issue .NET Framework interaction with Visual Studio to avoid conflicts between design-time and debug/runtime compilation of some .NET Framework ASP.NET project that could result in slowed developer experience for large projects.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 5 quoted passages · compared with Microsoft's page on Oct 20, 2026
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 4/5, clarity 3/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake