Issues

• ConcurrencyLimiter: a waiter cancelled during a release can leave a free permit that a queued request never gets

  area-System.Threadinguntriaged
  dotnet/runtime#136745 · Filter by author mthalman opened on Oct 31, 2026
  1

• TcpClient.Connect might throw NullReferenceException on macOS

  area-System.Net.Socketsuntriaged
  dotnet/runtime#136744 · Filter by author 0xced opened on Oct 31, 2026
  1

• [wasm] Managed Wide-Vector (256, 512) SIMD Fallbacks are Very Expensive in Size

  arch-wasmarea-CodeGen-coreclrtenet-performance
  dotnet/runtime#136741 · Filter by author adamperlin opened on Oct 30, 2026
  4

• Microsoft.NET.HostModel.ComHost.ResourceUpdater.Update does not update the file's mtime

  area-System.IOuntriaged
  dotnet/runtime#136736 · Filter by author puetzk opened on Oct 30, 2026
  1

• [wasm][JIT] RA declares wasm locals that are never used when a parameter's virtual register index differs from its ABI register

  arch-wasmarea-CodeGen-coreclruntriaged
  dotnet/runtime#136727 · Filter by author lewing opened on Oct 30, 2026
  2

• [JIT] Push APX callee-saved registers in ascending order so Unwind V3 can use WOD_PUSH_CONSECUTIVE_2

  area-CodeGen-coreclruntriaged
  dotnet/runtime#136724 · Filter by author Ruihan-Yin opened on Oct 30, 2026
  1

• [JIT] R2R generic runtime lookups (CORINFO_HELP_READYTORUN_GENERIC_HANDLE) are not hoisted out of loops

  arch-wasmarea-CodeGen-coreclrtenet-performanceuntriaged
  dotnet/runtime#136723 · Filter by author lewing opened on Oct 30, 2026
  2

  

• [API Proposal]: SearchValues<ImmutableArray<byte>>

  api-suggestionarea-System.Runtimeuntriaged
  dotnet/runtime#136721 · Filter by author TonyValenti opened on Oct 30, 2026
  2

• [API Proposal]: String-to-String Base64 Encode/Decode

  api-suggestionarea-System.Runtimeuntriaged
  dotnet/runtime#136711 · Filter by author Aziz-Dhiab opened on Oct 30, 2026
  3

• [aw] Detection Runs

  agentic-workflowsuntriaged
  dotnet/runtime#136701 · Filter by author github-actions opened on Oct 30, 2026
  2

• Culture initialization crashes the process for a locale with a variant and no territory

  area-System.Globalization
  dotnet/runtime#136700 · Filter by author rameel opened on Oct 30, 2026 · 12.0.0
  1

• File_Move_Multiple_From_Watched_To_Unwatched_Mac fails with out-of-order Deleted events on osx-arm64

  area-System.IOuntriaged
  dotnet/runtime#136698 · Filter by author armanossiloko opened on Oct 30, 2026
  1

• arm64: Improve ARM64 JIT code generation and register allocation

  arch-arm64area-CodeGen-coreclr
  dotnet/runtime#136694 · Filter by author jonathandavies-arm opened on Oct 30, 2026 · 12.0.0
  1

• [wasi] .NET 10: WasmEnableSIMD with AOT fails because WasiApp.targets has -msimd128 commented out

  area-Build-monountriaged
  dotnet/runtime#136693 · Filter by author zion-sati opened on Oct 30, 2026

• [wasi] net11.0 wasi-wasm apps don't build: the workload is not activated, and the native link needs WasiHttpWorld_component_type.wit that the runtime pack no longer ships

  area-Build-monountriaged
  dotnet/runtime#136691 · Filter by author zion-sati opened on Oct 30, 2026

• [wasm][interpreter] Vector128.Narrow(ushort, ushort) saturates instead of truncating once the method is tiered up

  arch-wasmarea-Codegen-Interpreter-monountriaged
  dotnet/runtime#136688 · Filter by author bisforboman opened on Oct 30, 2026
  3

• NativeAOT arm64: loop over a preinitialized static array of structs reads the array through an unrelocated object handle (movz/movk), crashing with an access violation

  area-CodeGen-coreclrbuguntriaged
  dotnet/runtime#136687 · Filter by author nullsoftware opened on Oct 30, 2026
  4

• [wasi] System.Net.Http.Functional.Tests work item times out (intermittent hang)

  arch-wasmarea-System.Net.Httpblocking-clean-ciKnown Build Erroros-wasi
  dotnet/runtime#136685 · Filter by author lewing opened on Oct 30, 2026 · 12.0.0
  4

  

• Stack trace line numbers on WASM

  arch-wasmarea-NativeAOT-coreclr
  dotnet/runtime#136676 · Filter by author MichalStrehovsky opened on Oct 30, 2026 · 12.0.0
  2

• Assert failure: !th.IsNull()

  area-VM-coreclrblocking-outerloopKnown Build Erroruntriaged
  dotnet/runtime#136674 · Filter by author VincentBu opened on Oct 30, 2026
  2

• IPGlobalProperties.GetActiveTcpListeners misses active wildcard listener after KB5127936

  area-System.Net.Socketstracking-external-issue
  dotnet/runtime#136672 · Filter by author varasavelli opened on Oct 30, 2026 · Future
  5

• ICorProfilerInfo4::GetILToNativeMapping2 ignores its reJitId argument

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#136669 · Filter by author pcshrosbree opened on Oct 29, 2026
  2

• Enroll libraries in unsafe-v2

  area-Infrastructure-librariesreduce-unsafe
  dotnet/runtime#136664 · Filter by author EgorBo opened on Oct 29, 2026 · 12.0.0
  3

  

• [wasm] [JIT]: Enable more GC-ref local candidates by introducing spilling

  arch-wasmarea-CodeGen-coreclrtenet-performance
  dotnet/runtime#136663 · Filter by author adamperlin opened on Oct 29, 2026 · 12.0.0
  2

• [wasm] [JIT]: Local copy coalescing

  arch-wasmarea-CodeGen-coreclrtenet-performance
  dotnet/runtime#136662 · Filter by author adamperlin opened on Oct 29, 2026 · 12.0.0
  5