The Update BureauKB5037587: Cumulative update for .NET Framework, versions 3.5 and 4.8.1, on Windows 10 21H2/22H2, May 2024. WPF crashes and CLR query errors addressed
Addresses reliability issues in .NET Framework, including app crashes in WPF and the CLR. It adds no new security improvements.
Does it affect you? Applies to: Windows 10, versions 21H2 and 22H2, with .NET Framework 3.5 or 4.8.1 installed. The page identifies Windows 10 version 22H2, and its related update information includes version 21H2.
Review notes Additional details from the official release notes (1) Read note
- Does it affect you? KB5037587 is the update for Windows 10 version 22H2. Windows 10 version 21H2 has a separate update, KB5038284.
The official sources are linked at the end of the page.
What changes
Fixes 6 changes
CLR
For: Apps using .NET Framework
-
Addresses a problem that can cause crashes when several threads query the same managed type.1
The issue can occur when multiple threads concurrently query the same managed type's
ITypeInfoimplementation. -
Addresses cases where symbol-reading APIs might return incorrect results.2
The affected APIs are
ISymUnmanagedReader::GetMethodsFromDocumentPositionandISymUnmanagedReader2::GetMethodsInDocument.
.NET Libraries
For: Apps using .NET Framework
.NET Fundamentals
For: Apps using .NET Framework with IIS 10
- Addresses an issue involving wildcard format changes introduced in IIS 10.4
WPF
For: WPF apps using .NET Framework
-
Addresses crashes in apps that call the
GetWindowTextandGetWindowTextLengthmethods.5
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2024-05-14
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5034466
- Replaced by
- KB5039893
| Version | File version | Channel |
|---|---|---|
| 3.5 | 2.0.50727.9176 | General availability |
| 4.8.1 | 4.8.9241.0 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
Updated components
139 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| WPF | 45 |
| .NET runtime (CLR) | 18 |
| WCF | 18 |
| ASP.NET | 3 |
Verified in package: changed files confirm WPF.
Sources
Cited passages from Microsoft's official notes (5)
-
1.
Addresses an issue where crashes can occur if several threads all concurrently query the ITypeInfo implementation of the same managed type.
support.microsoft.com -
2.
Addresses an issue with ISymUnmanagedReader::GetMethodsFromDocumentPosition and ISymUnmanagedReader2::GetMethodsInDocument API's might result in incorrect results under certain circumstances.
support.microsoft.com -
3.
Addresses an issue which can be triggered in the fbx file parser. - Addresses an issue to use MIST validated implementations of FIPS algorithms.
support.microsoft.com -
4.
Addresses an issue with wildcard format changes introduced in IIS 10.
support.microsoft.com -
5.
Addresses an issue where apps crash when calling GetWindowText and GetWindowTextLength methods.
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 3/5, clarity 4/5, completeness 4/5. 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