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.NET Framework 3.5 / 4.7.2 .NET Framework 3.5 / 4.7.2 Update
Patch Tuesday

KB5034619

KB5034619: Cumulative update for .NET Framework, versions 3.5 and 4.7.2, on Windows 10 1809 and Windows Server 2019, February 2024. Illegal-path errors in some ASP.NET MVC requests addressed

In short

The update addresses an illegal-path error in some ASP.NET MVC requests. It adds no new security improvements but includes previously released ones.

Does it affect you? Applies to: Devices running Windows 10, version 1809, or Windows Server 2019, with .NET Framework 3.5 or 4.7.2 installed.

File version
2.0.50727.9063 · 4.7.4087.0
Restart
Required

What changes

Fix 1 change

ASP.NET

Verified in package

For: Applications using ASP.NET MVC

  • The update addresses an illegal-path error in some ASP.NET MVC requests.1
    The error is System.ArgumentException: Illegal characters in path.

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
KB5036604
VersionFile versionChannel
3.5 2.0.50727.9063 General availability
4.7.2 4.7.4087.0 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSC 2019 / Windows Server 2019
78.2 MB
windows10.0-kb5034619-x64.msu Main update · KB5034619 SHA-1: c5f0b686…b3c81f
Arm64 Windows 10 Enterprise LTSC 2019
44.1 MB
windows10.0-kb5034619-arm64.msu Main update · KB5034619 SHA-1: 8b661afa…947800
x86 Windows 10 Enterprise LTSC 2019
44.1 MB
windows10.0-kb5034619-x86.msu Main update · KB5034619 SHA-1: a2dd0646…34945e

Updated components

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

Top changed componentsFiles
ASP.NET15

Verified in package: changed files confirm ASP.NET.

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. Addresses an issue with "System.ArgumentException: Illegal characters in path" in some ASP.Net MVC requests. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage · 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 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