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Microsoft .NET Framework Update Version January 2026 cumulative update preview

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Update Summary

January 29, 2026 cumulative update preview for Windows 11 and .NET Framework 3.5/4.8.1. It includes quality and reliability fixes for ClickOnce SHA384/SHA512 verification and an Arm64 CLR crash, with no new security improvements. Reference IDs: 5074828, 5074831.

Update Details

Bug Fixes

  • Adds verification logic for ClickOnce to support SHA384 and SHA512 in .NET Framework 4.8.1.
  • Fixes an Arm64 CLR crash that could occur when code generates and catches a NullReferenceException within the same function in .NET Framework 4.8.1.

Hints

  • The OS KB is used for update offering; the specific .NET Framework update installed depends on the version already present on the device.
  • Expected installed updates are the .NET Framework-specific KBs 5074828 for Windows 11 version 25H2 and 5074831 for Windows 11 version 24H2.

Product Information

Vendor: Microsoft

Product: .NET Framework

Product type: Other

Platform: Windows

Version: January 2026 cumulative update preview

Vendor release date: Jan 29, 2026

Original release notes: View on vendor site

Published on updatealert.io: Jun 5, 2026

Description: Developer runtime and framework for building and running Windows applications.

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