This week we released the October 2023 Security and Quality Rollup Updates for .NET Framework.

Security Copy link

The October Security and Quality Rollup Update does not contain any new security fixes. See September 2023 Security and Quality Rollup for the latest security updates.

Quality and Reliability Copy link

This release contains the following quality and reliability improvements.

ASP.NET

• Addresses an issue with “System.ArgumentException: Illegal characters in path” in some ASP.Net MVC requests.

SqlClient

• Addresses an issue with SQL event source telemetry.

Getting the Update Copy link

The Security and Quality Rollup is available via Windows Update, Windows Server Update Services, and Microsoft Update Catalog.

**Note**: Customers that rely on Windows Update and Windows Server Update Services will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.

The following table is for Windows 10, version 1507 and Windows Server 2016 versions and newer operating systems.

The following table is for earlier Windows and Windows Server versions.

Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:

• .NET Framework September 2023 Cumulative Update Preview
• .NET Framework September 2023 Security and Quality Rollup Updates
• .NET Framework August 2023 Cumulative Update Preview
• .NET Framework August 2023 Security and Quality Rollup Updates