.NET 11.0.0-rc.1 released for testing
.NET 11.0.0-rc.1 was released on 2026-09-08. It ships .NET Runtime 11.0.0-rc.1.26425.128, ASP.NET Core Runtime 11.0.0-rc.1.26425.128, SDK 11.0.100-rc.1.26425.128. The official release metadata lists 6 CVEs addressed in this release. .NET 11.0 is an STS release currently in the "go-live" support phase. It has since been superseded by .NET 11.0.0-rc.2.
What was released From the source
According to Microsoft's official .NET release metadata, .NET 11.0.0-rc.1 was published on 2026-09-08. The components and versions in this release are:
- Release: .NET 11.0.0-rc.1
- Release date: 2026-09-08
- .NET Runtime: 11.0.0-rc.1.26425.128
- ASP.NET Core Runtime: 11.0.0-rc.1.26425.128
- SDK versions: 11.0.100-rc.1.26425.128
- C# language version: 14.0
- Release type: STS
- Support phase: Go-live (supported in production)
- Latest .NET 11.0 release: 11.0.0-rc.2
- Security release: Yes (6 CVEs listed)
At a glance · .NET release
Security fixes listed for this release From the source
The release metadata marks this as a security release and lists the following CVE identifiers. Severity, affected components and mitigations for each CVE are described in the official release notes and the CVE records.
- CVE-2026-69439
- CVE-2026-71328
- CVE-2026-69522
- CVE-2026-69304
- CVE-2026-58649
- CVE-2026-69806
Why it matters Analysis
Previews and release candidates let teams test upcoming platform changes and report regressions before general availability. This channel is in the "go-live" phase, which Microsoft's support policy defines as supported for production use.
A newer build of .NET 11.0, 11.0.0-rc.2, has been released since, so new testing should start from that build.
Who should care Analysis
- Teams running .NET 11.0 applications in production or testing
- Owners of container images built on .NET 11.0 base images
- Teams that publish self-contained or single-file applications
- Developers and CI pipelines that pin an SDK version in global.json
How to update Analysis
- Check installed versions with
dotnet --list-runtimesanddotnet --list-sdks. - Install the latest .NET 11.0 release, 11.0.0-rc.2, from the official download page or your operating system's package manager.
- Rebuild container images so they pick up the updated base image, and rebuild self-contained apps.
- Read the release notes for known issues and run your test suite before rolling out to production.
Sources and further reading
- .NET 11.0.0-rc.1 release notes (original source)
- .NET 11.0 release metadata (JSON) (official)
- Download .NET 11.0 (official)
- .NET support policy (documentation)
Original: “.NET 11.0.0-rc.1 released with 6 security fixes”, .NET release metadata, published 8 Sep 2026, retrieved 16 Oct 2026. This article was generated from the official source using our structured templates and passed automated quality checks. Spotted a mistake? See our corrections policy.