.NET 8 and .NET 9 End of Support: What Stops, and What Does Not"

Show Notes

Hey everyone, and welcome back to The Modern .NET Show; the premier .NET podcast, focusing entirely on the knowledge, tools, and frameworks that all .NET developers should have in their toolbox. I'm your host Jamie Taylor, bringing you conversations with the brightest minds in the .NET ecosystem.

Today's episode is a little different from the norm. There's no guest; it's just me. And there's a date coming that I'd rather tell you about early than late.

So let's sit back, open up a terminal, type in `dotnet new podcast` and we'll dive into the core of Modern .NET.

Full Show Notes

The full show notes, including links to some of the things we discussed and a full transcription of this episode, can be found at: https://dotnetcore.show/season-9/net-8-and-net-9-end-of-support-what-stops-and-what-does-not/

Useful Links:

• This series
  • Bridging the Gap: Taking It Upstairs, every episode's business case on one page
  • s09e01 - You Are Not Behind: Why You Are Still On .NET Framework, part 1 of Bridging the Gap
  • s09e02 - You Might Not Need to Upgrade: The Case for Staying Put, part 2 of Bridging the Gap
• Microsoft lifecycle pages, which are the authority for every date in this episode
  • .NET and .NET Core official support policy
  • .NET 8 and .NET 9 will reach End of Support on November 10, 2026
  • ASP.NET and ASP.NET Core official support policy
  • Entity Framework Core releases and planning
  • PowerShell support lifecycle
  • .NET MAUI support policy
  • ASP.NET Core 2.3 end of support
• Hosting and packaging
  • Migrate .NET Azure Functions to the isolated worker model
  • Azure Functions runtime and language versions
  • Migrate Consumption plan apps to the Flex Consumption plan
  • Azure App Service language runtime support policy
  • .NET container image tag lifecycle
  • Life Cycle and Support Policies for the .NET Program on Red Hat Enterprise Linux
  • Umbraco long term support and end of life
  • Kentico product support lifecycle
• CVE-2025-55315, if you want to check the advisory yourself
  • Microsoft Security Advisory CVE-2025-55315
  • Understanding CVE-2025-55315 - Microsoft Security Response Center
  • Understanding the worst .NET vulnerability ever - Andrew Lock
  • CVE-2025-55315 on the Ubuntu security tracker
  • Reproducing CVE-2025-55315 - Hayden Barnes, HeroDevs
• Episodes referenced in this one
  • S08E07b - Hayden Barnes and CVE-2025-55315
  • s09e04 - You Might Not Need to Upgrade: The Case for Staying Put

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Music created by Mono Memory Music, licensed to RJJ Software for use in The Modern .NET Show.

Editing and post-production services for this episode were provided by MB Podcast Services.