.NET 9.0.21 was released on 2026-10-13. It ships .NET Runtime 9.0.21, ASP.NET Core Runtime 9.0.21, SDK 9.0.319, 9.0.122. The official release metadata lists 42 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10.
The dotnet/efcore repository published v9.0.21 on 2026-10-13. The release notes list changes including: Merging internal commits for release/8.0 by @dotnet-bot (#38782); [release/9.0] Update dependencies from dotnet/arcade by @dotnet-maestro[bot] (#38814).
The dotnet/efcore repository published v9.0.20 on 2026-09-08. The release notes list changes including: [release/8.0] Update Windows CI images to 2022 by @AndriySvyryd (#38526); [release/8.0] Update branding to 8.0.30 by @dotnet-bot (#38563).
.NET 9.0.20 was released on 2026-09-08. It ships .NET Runtime 9.0.20, ASP.NET Core Runtime 9.0.20, SDK 9.0.318, 9.0.121. The official release metadata lists 6 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
The dotnet/efcore repository published v9.0.19 on 2026-08-11. The release notes list changes including: [release/9.0] Update branding to 9.0.19 by @dotnet-bot (#38564); [release/9.0]: Bump Microsoft.Azure.Cosmos from 3.49.0 to 3.61.0 by @dependabot[bot] (#38529).
.NET 9.0.19 was released on 2026-08-11. It ships .NET Runtime 9.0.19, ASP.NET Core Runtime 9.0.19, SDK 9.0.317, 9.0.120. The official release metadata lists 10 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.18 was released on 2026-07-14. It ships .NET Runtime 9.0.18, ASP.NET Core Runtime 9.0.18, SDK 9.0.316, 9.0.119. The official release metadata lists 17 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.17 was released on 2026-06-09. It ships .NET Runtime 9.0.17, ASP.NET Core Runtime 9.0.17, SDK 9.0.315, 9.0.118. The official release metadata lists 3 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.16 was released on 2026-05-12. It ships .NET Runtime 9.0.16, ASP.NET Core Runtime 9.0.16, SDK 9.0.314, 9.0.117. The official release metadata lists 4 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.15 was released on 2026-04-14. It ships .NET Runtime 9.0.15, ASP.NET Core Runtime 9.0.15, SDK 9.0.313, 9.0.116. The official release metadata lists 4 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.14 was released on 2026-03-10. It ships .NET Runtime 9.0.14, ASP.NET Core Runtime 9.0.14, SDK 9.0.312, 9.0.115. The official release metadata lists 2 CVEs addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.
.NET 9.0.13 was released on 2026-02-10. It ships .NET Runtime 9.0.13, ASP.NET Core Runtime 9.0.13, SDK 9.0.311, 9.0.114. The official release metadata lists 1 CVE addressed in this release. .NET 9.0 is an STS release currently in the "maintenance" support phase, with support ending on 2026-11-10. It has since been superseded by .NET 9.0.21.