Platform updates for .NET on App Service Windows

less than 1 minute read • By Byron Tardif • October 20, 2025

The App Service team is working closely with the .NET team to address a set of issues that have impacted our ability to deliver updates to the .NET runtime versions provided by the platform on Windows.

We are currently deploying a patch to our HTTP load balancer infrastructure (aka Front Ends) to mitigate CVE-2025-55315. This patch will protect applications on both Windows and Linux instances from the impact of this CVE, even if the underlying .NET runtime remains on an affected version.

When will my app be updated?

  • Apps hosted on Windows instances targeting .NET 8 and .NET 9 will be delayed in receiving runtime updates through the platform. We will resume regular updates once we have resolved the blocking issue.
  • Apps hosted on Windows instances targeting .NET 10 will continue to receive updates on our regular cadence.
  • Linux instances are not impacted and will continue to receive updates on our regular cadence.

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