Microsoft .NET Framework Update Version KB5122386; KB5122385
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Update Summary
August 27, 2026 cumulative update preview for .NET Framework 3.5 and 4.8.1. It contains no new security improvements and fixes intermittent 64-bit .NET Framework crashes in .NET Runtime. Reference IDs: KB5122386, KB5122385.
Update Details
Bug Fixes
- Fixes an issue where intermittent crashes could occur in some 64-bit .NET Framework scenarios on .NET Framework 4.8.1.
Hints
- This update is cumulative and includes all previously released security improvements.
- For Windows 11, version 26H1, the .NET Framework-specific update is KB5122386.
- For Windows 11, version 25H2 and 24H2, the .NET Framework-specific update is KB5122385.
- The operating system KB is used for update offering purposes; the installed update should be the .NET Framework-specific KB that matches the version already present on the device.
Product Information
Vendor: Microsoft
Product: .NET Framework
Product type: Other
Platform: Windows
Version: KB5122386; KB5122385
Vendor release date: Aug 27, 2026
Original release notes: View on vendor site
Published on updatealert.io: Aug 29, 2026
Description: Developer runtime and framework for building and running Windows applications.