Issues

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

  area-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
  1

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

  area-System.Globalizationuntriaged
  dotnet/runtime#136700 · Filter by author rameel opened on Oct 30, 2026
  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-coreclruntriaged
  dotnet/runtime#136687 · Filter by author nullsoftware opened on Oct 30, 2026
  1

• [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
  3

  

• 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

• Test failure: JIT/Regression_2/Runtime_53549/Runtime_53549_1/Runtime_53549_1.cmd

  area-VM-coreclrblocking-outerloopKnown Build Error
  dotnet/runtime#136675 · Filter by author VincentBu opened on Oct 30, 2026 · 12.0.0
  5

  

• 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.Socketsuntriaged
  dotnet/runtime#136672 · Filter by author varasavelli opened on Oct 30, 2026
  4

• 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
  3

• [System.Formats.Tar] TarReader throws undocumented OverflowException and ArgumentOutOfRangeException for malformed numeric header fields

  area-System.Formats.Taruntriaged
  dotnet/runtime#136659 · Filter by author earbona23 opened on Oct 29, 2026
  1

• XDocument.Parse / XDocument.Load take O(depth²) time: XContainer.AddNodeSkipNotify walks to the root for each added node

  area-System.Xmluntriaged
  dotnet/runtime#136658 · Filter by author Albasha0x0 opened on Oct 29, 2026
  1

• [API Proposal]: X509Certificate.GetSafeHandle

  api-suggestionarea-System.Security
  dotnet/runtime#136652 · Filter by author vcsjones opened on Oct 29, 2026
  10

• [ci-scan] Test failure: System.Net.Http.Functional.Tests.SocketsHttpHandler_HttpClientHandler_ClientCertificates_Test.Android_GetCertificateFromKeyStoreViaAlias

  area-System.Securityblocking-clean-ciKnown Build Erroros-androiduntriaged
  dotnet/runtime#136641 · Filter by author EgorBo opened on Oct 29, 2026
  2

• [ci-scan] Hang: System.Security.Cryptography.Xml.Tests.EncryptedXmlTests.DeepNonRootDecryptedXml_Throws

  area-System.Securityblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136624 · Filter by author EgorBo opened on Oct 29, 2026
  1

• [API Proposal]: Allow Utf8JsonReader to be driven by a custom token source

  area-System.Text.Jsonuntriaged
  dotnet/runtime#136620 · Filter by author SimonCropp opened on Oct 29, 2026
  1

• PropertyChangedEventArgs should have a nice DebuggerDisplay

  area-System.ComponentModeluntriaged
  dotnet/runtime#136608 · Filter by author TonyValenti opened on Oct 28, 2026
  2