Issues

• NonBacktracking regex misses a match when word-boundary alternatives repeat

  area-System.Text.RegularExpressionsuntriaged
  dotnet/runtime#135586 · Filter by author robertmorelli opened on Oct 11, 2026
  1

• regex NonBacktracking chooses a longer match than the backtracking engines

  area-System.Text.RegularExpressionsuntriaged
  dotnet/runtime#135585 · Filter by author robertmorelli opened on Oct 11, 2026
  1

• Regex counted repetition of a greedy loop returns a too-short match

  area-System.Text.RegularExpressionsuntriaged
  dotnet/runtime#135584 · Filter by author robertmorelli opened on Oct 11, 2026
  1

• QuicStream leaks its native QUIC_BUFFER array for every stream that sends data

  area-System.Net.Quicuntriaged
  dotnet/runtime#135583 · Filter by author WilliamSmithEdward opened on Oct 11, 2026
  1

• double.ToString("R") is not round-trippable for 2^-25 and 2^-958 on .NET 10 (regression from .NET 8)

  area-System.Numericsuntriaged
  dotnet/runtime#135582 · Filter by author BVV027 opened on Oct 11, 2026
  1

• ReadyToRun: packed debug bounds lose high bits and include padding entries

  area-CodeGen-coreclruntriaged
  dotnet/runtime#135578 · Filter by author Gladskih opened on Oct 10, 2026
  1

• [ci-scan] Test failure: System.Text.RegularExpressions.Tests.RegexCompileToAssemblyTests.CompileToAssembly_SimpleTest

  area-System.Text.RegularExpressionsblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135574 · Filter by author EgorBo opened on Oct 10, 2026
  1

• System.Globalization.Native: configure checks ignore CMAKE_ICU_DIR's headers on Unix targets other than wasm

  area-Infrastructure-coreclruntriaged
  dotnet/runtime#135571 · Filter by author caraioniurie47 opened on Oct 10, 2026

• JIT: Vector512.Shuffle on bytes is not accelerated without AVX512-VBMI, even for in-lane constant indices

  area-CodeGen-coreclrtenet-performanceuntriaged
  dotnet/runtime#135570 · Filter by author HMBSbige opened on Oct 10, 2026
  1

• NetworkInterface.GetAllNetworkInterfaces throws DirectoryNotFoundException on Linux when /etc does not exist

  area-System.IOuntriaged
  dotnet/runtime#135568 · Filter by author caraioniurie47 opened on Oct 10, 2026
  1

• NativeAOT: reflection on static abstract interface methods crashes in .NET 11 (10.0 throws NotSupportedException)

  area-NativeAOT-coreclruntriaged
  dotnet/runtime#135565 · Filter by author caraioniurie47 opened on Oct 10, 2026
  1

• cDAC dump tests (windows-arm64): test host fails fast on a FileStream assert in ClrMD's Minidump.ReadThreadData

  area-System.IOuntriaged
  dotnet/runtime#135559 · Filter by author pcshrosbree opened on Oct 10, 2026
  1

• Test failure: Regressions/coreclr/GitHub_135234/test135234/test135234.cmd

  area-VM-coreclrblocking-outerloopKnown Build Erroruntriaged
  dotnet/runtime#135558 · Filter by author VincentBu opened on Oct 10, 2026
  1

  

• Test failure: JIT/opt/GuardedDevirtualization/badinlinee/badinlinee.cmd

  area-CodeGen-coreclrblocking-clean-ci-optionalKnown Build Erroruntriaged
  dotnet/runtime#135557 · Filter by author VincentBu opened on Oct 10, 2026
  2

• [wasm] [r2r] Optimize the layout of the final binary by re-ordering portions of the file

  arch-wasmarea-ReadyToRununtriaged
  dotnet/runtime#135556 · Filter by author davidwrighton opened on Oct 10, 2026
  3

• Use After Free Read when misusing X509Chain class

  area-System.Securityuntriaged
  dotnet/runtime#135542 · Filter by author Mrnikbobjeff opened on Oct 9, 2026
  1

• [Mono] TypeBuilder.CreateType() aborts the process with g_error for a method whose parameter is a ModifiedType

  area-System.Reflectionruntime-monountriaged
  dotnet/runtime#135539 · Filter by author caraioniurie47 opened on Oct 9, 2026
  1

• ZipArchive Update: changing LastWriteTime of a ZipCrypto entry makes its correct password fail

  area-System.IO.Compressionuntriaged
  dotnet/runtime#135538 · Filter by author pawlos opened on Oct 9, 2026
  2

• [Interpreter] Checked runtime asserts Thread::IsObjRefValid(this) on an interpreted virtual call after CreateCustomAttributeInstance unregisters its GC frame

  area-CodeGen-Interpreter-coreclruntriaged
  dotnet/runtime#135535 · Filter by author pcshrosbree opened on Oct 9, 2026
  3

• [Interpreter] ResumeAfterCatchException escapes ThrowControlForThread when compiled code raises a thread abort again and an interpreted frame catches it

  area-CodeGen-Interpreter-coreclruntriaged
  dotnet/runtime#135532 · Filter by author pcshrosbree opened on Oct 9, 2026
  2

• Checked runtime asserts in CallCatchFunclet on Windows x64 with shadow stacks when a thread abort raised at the end of a catch is caught in the same method

  area-VM-coreclruntriaged
  dotnet/runtime#135530 · Filter by author pcshrosbree opened on Oct 9, 2026
  2

• JIT: (bug) [ARM64] Vector64.ToVector128() zeroing of the upper lanes is dropped by the inverse-mov peephole (wrong code)

  area-CodeGen-coreclr
  dotnet/runtime#135529 · Filter by author EgorBo opened on Oct 9, 2026 · 12.0.0
  1

• JIT: (bug) [ARM64] assert targetReg != argReg for VectorTableLookupExtension when defaultValues is also a table vector

  area-CodeGen-coreclr
  dotnet/runtime#135528 · Filter by author EgorBo opened on Oct 9, 2026 · 12.0.0
  1

• JIT: (bug) [ARM64] Vector3 field of a by-value stack struct argument hits the genExactlyOneBit(availableSet) assert (wrong code in Release)

  area-CodeGen-coreclr
  dotnet/runtime#135527 · Filter by author EgorBo opened on Oct 9, 2026 · 12.0.0
  1

• JIT: (bug) [ARM64] assert varTypeIsSIMD(indexedElementOpType) for AdvSimd.MultiplyBySelectedScalar with Vector64.CreateScalarUnsafe

  area-CodeGen-coreclr
  dotnet/runtime#135526 · Filter by author EgorBo opened on Oct 9, 2026 · 12.0.0
  1