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dotnet · dotnet/runtime · v9.0.17Good to know

dotnet/runtime v9.0.17: WebSocket fix, JIT bug fix, MsQuic update, CRL cache

Release v9.0.17 of dotnet/runtime includes multiple fixes and dependency updates: WebSocket server now denies unmasked frame receive; JIT loop cloning bug fix f

10 Jun 2026Read 1 minSeverity: good to know

What changed

Release v9.0.17 of dotnet/runtime includes multiple fixes and dependency updates: WebSocket server now denies unmasked frame receive; JIT loop cloning bug fix for down-counting loops; MsQuic update; in-memory cache for CRLs on Linux; various dependency updates and infrastructure changes.

Who it affects

Developers using .NET 9.0 runtime, especially those using WebSocket server, JIT compilation, QUIC, or certificate revocation on Linux.

What to do today

Update to .NET 9.0.17 to benefit from fixes and improvements.

The trail
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