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Microsoft .NET Framework Update Version February 2026 cumulative update

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Update Summary

Released February 10, 2026. This cumulative update includes security improvements for CVE-2025-55248 and quality/reliability fixes for .NET Framework 4.8.1, including ClickOnce SHA384/SHA512 verification and an Arm64 CLR crash fix. Reference IDs: 5074837.

Update Details

Security

  • Addresses CVE-2025-55248: information disclosure vulnerability.

Bug Fixes

  • Updates operating system calls for compliance with current standards in .NET Framework 4.8.1.
  • 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.

Hints

  • The operating system KB is used for update offering purposes; the installed update is the .NET Framework-specific update based on what is already present on the device.
  • The .NET Framework 4.8.1 update listed is 5074837.

Product Information

Vendor: Microsoft

Product: .NET Framework

Product type: Other

Platform: Windows

Version: February 2026 cumulative update

Vendor information published: Feb 10, 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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