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KB5086097 Delivers April 2026 Security Update for .NET 9.0.15

April 2026 Patch Tuesday security update for .NET 9.0. Updates to version 9.0.15. Per Microsoft, includes security fixes for the .NET 9.0 runtime and ASP.NET Core components. Part of the 167-flaw April 2026 Patch Tuesday release.

By Emanuel De Almeida

2 min read
Square cybersecurity news cover highlighting Microsoft update KB5086097, the April 2026 security update for .NET 9.0.15.
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Key takeaways

  • Updates .NET 9.0 to version 9.0.15 with security fixes.
  • Covers runtime, ASP.NET Core, Desktop Runtime, SDK, and Hosting.
  • .NET 9.0 is STS with end of support May 2026.
  • Migrate to .NET 10 (LTS) for long-term support.

KB5086097 is the April 2026 security update for .NET 9.0, updating to version 9.0.15. Per the .NET Blog, it includes security fixes for the runtime and ASP.NET Core. .NET 9.0 is approaching end of Standard Term Support.

April 2026 security update for .NET 9.0 brings version 9.0.15 with security fixes.

.NET 9.0.15. Security fixes. STS ending May 2026. Migrate to .NET 10.

KB5086097 Updates .NET 9.0 to Version 9.0.15

Microsoft released KB5086097 on April 14, 2026, a security update for .NET 9.0. Per the .NET Blog, it updates .NET 9.0 to version 9.0.15 with security fixes. The update applies to .NET 9.0 runtime, ASP.NET Core, Desktop Runtime, SDK, and Hosting components on Windows, Linux, and macOS.

Per the ManageEngine Patch Tuesday listing, KB5086097 covers Hosting, AspNet Core, Desktop Runtime, Runtime, and SDK components across x64, x86, and ARM64 architectures. Part of the 167-flaw April 2026 Patch Tuesday release.

.NET 9.0 Approaching End of Support

.NET 9.0 is a Standard Term Support (STS) release with support until May 2026. Organizations should plan migration to .NET 10 (LTS) for long-term support. The April security update is one of the last for .NET 9.0 before end of support.

All .NET 9.0 Platforms

All .NET 9.0 installations before 9.0.15 on Windows, Linux, macOS. Available via Windows Update, WSUS, MU Catalog, and dotnet.microsoft.com.

Response

Response status: No response

Patch available: No

Workaround available: No

FAQ

What does KB5086097 fix?

Security fixes for the .NET 9.0 runtime and ASP.NET Core components. Updates to version 9.0.15.

Is .NET 9.0 still supported?

.NET 9.0 is Standard Term Support (STS) with end of support in May 2026. Migrate to .NET 10 (LTS) for continued support.

Sources

  1. .NET and .NET Framework April 2026 servicing updatesOfficial

    Microsoft · Apr 14, 2026 · Primary source

    Claims supported
    • Security fixes
    • Version 9.0.15
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