Release Date:April 14, 2026
Version: .NET Framework 3.5 and 4.8
The April 14, 2026 update for Windows Server 2022 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8. 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 detailed in CVE-2026-26171.
CVE-2026-33116 - .NET Framework Information Disclosure vulnerability This security update addresses an information disclosure vulnerability detailed in CVE-2026-33116.
Quality and Reliability Improvements
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.NET Runtime |
- Addresses an issue to add verification logic for ClickOnce to support SHA384 and SHA512 |
Additional information about this update
The following articles contain additional information about this update as it relates to individual product versions.
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5084071 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows Server 2022 (KB5084071)
Known issues in this update
Microsoft is not currently aware of any issues in this update.
How to get this update
Install this update
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Release Channel |
Available |
Next Step |
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Windows Update and Microsoft Update |
Yes |
None. This update will be downloaded and installed automatically from Windows Update. |
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Windows Update for Business |
Yes |
None. This update will be downloaded and installed automatically from Windows Update. |
|
Microsoft Update Catalog |
Yes |
To get the standalone package for this update, go to the Microsoft Update Catalog website. |
|
Windows Server Update Services (WSUS) |
Yes |
This individual .NET Framework product update will be installed, as applicable, by applying the operating system update. For more information about operating system updates see additional information about this update section. |
File information
For a list of the files that are provided in this update, download the file information for cumulative update.
Prerequisites
To apply this update, you must have .NET Framework 3.5 or 4.8 installed.
Restart requirement
You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.
How to obtain help and support for this update
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Help for installing updates: Windows Update FAQ
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Protect yourself online and at home: Windows Security support
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Local support according to your country: International Support
