KB5082420

April 14, 2026-KB5082420 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2

Applies To

.NET

Release Date:

April 14, 2026

Version:

.NET Framework 3.5 and 4.8.1

The April 14, 2026 update for Windows 11, version 24H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Summary

Security Improvements

CVE-2026-32178 - .NET Framework Remote Code Execution vulnerability

This security update addresses a remote code execution vulnerability detailed in CVE-2026-32178.

CVE-2026-32203 - .NET Framework Denial of Service vulnerability

This security update addresses a denial-of-service vulnerability detailed in CVE-2026-32203.

CVE-2026-32226 - .NET Framework Denial of Service vulnerability

This security update addresses a denial-of-service vulnerability detailed in CVE-2026-32226.

CVE-2026-23666 - .NET Framework Denial of Service vulnerability

This security update addresses a denial-of-service vulnerability detailed in CVE-2026-23666.

CVE-2026-26171 - .NET Framework Security Feature Bypass vulnerability

This security update addresses a security feature bypass vulnerability...