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.NET Framework 3.5 / 4.8 .NET Framework 3.5 / 4.8 Update
Patch Tuesday

KB5055169

KB5055169: Cumulative update for .NET Framework, versions 3.5 and 4.8, on Windows Server 2022, April 2025. Large print jobs and file operations on network shares addressed

In short

Addresses a WPF printing problem that could cause an OutOfMemory exception and an issue with .NET file and directory operations on network shares.

Does it affect you? Applies to: Windows Server 2022 devices with .NET Framework 3.5 or 4.8 installed.

File version
2.0.50727.9179 · 4.8.4785.0
Restart
Required

What changes

Fixes 2 changes

WPF

Verified in package

For: Applications that print many pages

  • Addresses a problem that could cause printing many pages to fail with an OutOfMemory exception.1
    Concerns Windows Presentation Foundation (WPF) printing.

.NET Fundamentals

For: Applications using network shares

  • Addresses an issue with .NET file and directory operations on network shares.2
    Concerns System.IO APIs operating on files and directories on UNC shares.

Technical details

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

Data sheet

Released
2025-04-08
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5046265
Replaced by
KB5062063
VersionFile versionChannel
3.5 2.0.50727.9179 General availability
4.8 4.8.4785.0 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 Windows Server 2022
72.4 MB
windows10.0-kb5055169-x64-ndp48.msu Main update · KB5055169 SHA-1: 07015721…a4aa49

Updated components

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

Top changed componentsFiles
WPF24
.NET runtime (CLR)12

Verified in package: changed files confirm WPF.

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. Addresses an issue with printing large number of pages due to an OutOfMemory exception. support.microsoft.com
  2. 2. Addresses an issue where System.IO APIs are used to operate on files and directories on UNC shares. 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 5/5, 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