The Update BureauKB5062063: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows Server 2022, July 2025. TypeDescriptor concurrency and DLL error-dialog issues addressed
In short
Addresses two .NET reliability issues involving TypeDescriptor and DLL loading. It includes previously released security improvements but adds none.
Does it affect you? Applies to: Windows Server 2022 devices with .NET Framework 3.5 or 4.8 installed.
What changes
Fixes 2 changes
.NET Libraries
For: Devices running applications that use these .NET APIs
-
A concurrency issue affecting .NET type-property and converter lookups is addressed.1
The issue involves
TypeDescriptor.GetProperties()andTypeDescriptor.GetConverter().
.NET Runtime
For: Devices running .NET Framework applications
-
An issue that can trigger error-reporting dialog boxes during .NET Framework DLL loading is addressed.2
The dialogs can be triggered by interactions between .NET Framework DLL loads and the OS code integrity enforcement policy.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-07-08
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5055169
- Replaced by
- KB5065748
| Version | File version | Channel |
|---|---|---|
| 3.5 | 2.0.50727.9179 | General availability |
| 4.8 | 4.8.4795.0 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
x64
Windows Server 2022
72.5 MB
Updated components
20 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| .NET runtime (CLR) | 12 |
Sources
Updated
Cited passages from Microsoft's official notes (2)
-
1.
Addresses an issue with concurrency in TypeDescriptor.GetConverter()issue in TypeDescriptor GetProperties() and GetConverter().
support.microsoft.com -
2.
Addresses an issue where interactions between .NET Framework DLL loads and OS code integrity enforcement policy trigger error reporting dialog boxes.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 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 5/5, clarity 4/5, 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