Microsoft .NET Framework Update

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Update Summary

May 12, 2026 cumulative update for Windows and .NET Framework. It includes security fixes for CVE-2026-32177 and CVE-2026-35433, with no additional quality improvements or known issues.

Update Details

Security

  • Addresses CVE-2026-32177: elevation of privilege vulnerability.
  • Addresses CVE-2026-35433: elevation of privilege vulnerability.

New Features

  • For Windows 11, version 26H1 (build 28000) and newer, the update installs the complete .NET Framework 3.5 product as a standalone installer, replacing any previously installed version.

Known Issues

  • No known issues are reported for this release.

Hints

  • This update is cumulative and includes all previously released quality and reliability improvements.
  • The operating system KB is used for update offering; the specific .NET Framework update installed depends on the .NET Framework version already present on the device.
  • For Windows 11, version 26H1 and newer, .NET Framework 3.5 is delivered as a full product update rather than a traditional component patch.
Product Information

Vendor: Microsoft

Product: .NET Framework

Release date: May 12, 2026

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