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.NET Framework 3.5 / 4.8.1 .NET Framework 3.5 / 4.8.1 Optional preview
Preview

KB5067931

KB5067931: Cumulative update for .NET Framework, versions 3.5 and 4.8.1, on Windows 11 25H2, October 2025. .NET Runtime calls updated to meet current standards

In short

The preview updates .NET Runtime operating-system calls for compliance with current standards. It adds no new security improvements.

Does it affect you? Applies to: Devices running Windows 11, version 25H2, with .NET Framework 3.5 or 4.8.1 installed.

File version
2.0.50727.9180 · 4.8.9323.0
Restart
Required

What changes

Improvement 1 change

.NET Runtime

For: devices with .NET Framework 3.5 or 4.8.1 installed

  • Operating-system calls are updated to comply with current standards.1

Technical details

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

Data sheet

Released
2025-10-28
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5066613
Replaced by
KB5074828
VersionFile versionChannel
3.5 2.0.50727.9180 General availability
4.8.1 4.8.9323.0 General availability

Security

No vulnerabilities are listed for this update.

Updated components

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

Top changed componentsFiles
.NET runtime (CLR)12

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. Addresses an issue to update operating system calls for compliance with current standards. 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 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