Skip to the content
The Update Bureau
.NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 Update
Patch Tuesday

KB5034624

KB5034624: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows 10 1809 and Windows Server 2019, February 2024. ASP.NET MVC path errors and outdated zlib addressed

In short

Addresses an illegal-path error in some ASP.NET MVC requests and an outdated OSS zlib library version. It contains no new security improvements.

Does it affect you? Applies to: Devices running Windows 10, version 1809, or Windows Server 2019 with .NET Framework 3.5 or 4.8 installed.

File version
2.0.50727.9063 · 4.8.4700.0
Restart
Required

What changes

Fixes 2 changes

ASP.NET

Verified in package

For: Applications making some ASP.NET MVC requests

  • Some ASP.NET MVC requests no longer encounter an illegal-characters-in-path error.1
    Addresses System.ArgumentException: Illegal characters in path in some ASP.NET MVC requests.

.NET Libraries

  • Addresses an issue with the outdated version of the OSS zlib library.2

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-02-13
Classification
Updates
Type
Cumulative update
Restart
Required
Replaced by
KB5036610
VersionFile versionChannel
3.5 2.0.50727.9063 General availability
4.8 4.8.4700.0 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSC 2019 / Windows Server 2019
80.3 MB
windows10.0-kb5034624-x64-ndp48.msu Main update · KB5034624 SHA-1: 9aaf1ded…33540d
x86 Windows 10 Enterprise LTSC 2019
47.7 MB
windows10.0-kb5034624-x86-ndp48.msu Main update · KB5034624 SHA-1: 78f93d6d…7e0fca

Updated components

52 files changed since the previous update for the same versions.

Top changed componentsFiles
WPF22
ASP.NET10

Verified in package: changed files confirm ASP.NET.

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. Addresses an issue with "System.ArgumentException: Illegal characters in path" in some ASP.Net MVC requests. support.microsoft.com
  2. 2. Addresses an issue where version of the OSS zlib library is out of date. 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