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[Profiler] duplicated ExceptionUnwindFunctionEnter/ExceptionUnwindFunctionLeave callbacks when exception is thrown from try-finally block.

area-VM-coreclr

Status: Open.

Bug

#123351 In dotnet/runtime;

· alexanderqqq opened on Jan 19, 2026

[.NET Core/Linux] X509 chain revocation check uses only first CDP URL, does not fall back to others

area-System.Security

os-linuxLinux OS (any supported distro)Linux OS (any supported distro)

Status: Open.

#121253 In dotnet/runtime;

· myaryn opened on Oct 31, 2025

[release/10.0] Assert Interop.Sys.LSeek(this, 0, Interop.Sys.SeekWhence.SEEK_CUR) >= 0 in System.Net.XXX tests

area-System.Net

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

Status: Open.

#121940 In dotnet/runtime;

· ericstj opened on Nov 24, 2025

Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-musl-x64 version 10.0.0 contains clang-19 linked against libc

arch-wasmWebAssembly architectureWebAssembly architecture

area-WorkloadsWorkloads like wasm-toolsWorkloads like wasm-tools

Status: Open.

#121975 In dotnet/runtime;

· zotanmew opened on Nov 25, 2025

Fingerprinting client-side assets using the old school hosted approach

arch-wasmWebAssembly architectureWebAssembly architecture

area-VM-meta-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#121993 In dotnet/runtime;

· Vizual-Dev opened on Nov 26, 2025

.NET 10 importmap - incompatible with secure Content Security Policy (CSP)

arch-wasmWebAssembly architectureWebAssembly architecture

area-System.Runtime.InteropServices.JavaScript

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#121885 In dotnet/runtime;

· rodolfograve opened on Nov 21, 2025

ILLink analyzer crashes with MissingMethodException

area-Tools-ILLink.NET linker development as well as trimming analyzers.NET linker development as well as trimming analyzers

Status: Open.

Bug

#123503 In dotnet/runtime;

· jjonescz opened on Jan 22, 2026

Parallel Powershell sessions lead to corruption of the StartUpProfileData cache created by ProfileOptimization.StartProfile

area-VM-coreclr

Status: Open.

#121977 In dotnet/runtime;

· daxian-dbw opened on Nov 26, 2025

Severe performance regression in .NET 10 vs .NET 9 for xUnit v3 test execution

arch-x64

area-VM-coreclr

os-windows

tenet-performancePerformance related issuePerformance related issue

Status: Open.

#123124 In dotnet/runtime;

· Schaeri opened on Jan 13, 2026

WasmFingerprintAssets false breaks type/value information in WASM debugging

arch-wasmWebAssembly architectureWebAssembly architecture

area-Debugger-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#122201 In dotnet/runtime;

· ArcadeMode opened on Dec 4, 2025

[10.0.2] "A fatal error has occurred loading the metadata for 'System.Private.CoreLib.dll' and debugging needs to be terminated."

arch-wasmWebAssembly architectureWebAssembly architecture

area-Debugger-mono

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#123659 In dotnet/runtime;

· ilonatommy opened on Jan 27, 2026

IndexOutOfRangeException in ILCompiler.LazyGenericsSupport.GraphBuilder.WalkMethod

area-NativeAOT-coreclr

blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

Status: Open.

#122845 In dotnet/runtime;

· am11 opened on Jan 4, 2026

PerfMap / CodeFragmentHeap lock-ordering deadlock during GC suspension

area-VM-coreclr

Status: Open.

Bug

#128401 In dotnet/runtime;

· leculver opened on May 20, 2026

.NET 10 regression: Runtime in COM server application crashes when it receives certain sequence of COM method calls (access violation)

area-Interop-coreclr

Status: Open.

#127512 In dotnet/runtime;

· spkl opened on Apr 28, 2026

[wasm] JSExport function with void return and parameters generate rest args

arch-wasmWebAssembly architectureWebAssembly architecture

area-System.Runtime.InteropServices.JavaScript

area-VM-meta-mono

needs-author-actionAn issue or pull request that requires more info or actions from the author.An issue or pull request that requires more info or actions from the author.

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#126590 In dotnet/runtime;

· MartelementAyy opened on Mar 13, 2026

Blazor WebAssembly debugger: decode_ptr_id assertion at startup, BPs solid-red but never hit — VS2026 18.6.0 + dn10 SDK 10.0.300 (similar to #121738 which is reportedly fixed)

arch-wasmWebAssembly architectureWebAssembly architecture

area-Debugger-mono

needs-author-actionAn issue or pull request that requires more info or actions from the author.An issue or pull request that requires more info or actions from the author.

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#128407 In dotnet/runtime;

· jon001 opened on May 20, 2026

[browser] Blazor - VTable setup of type WebAssemblyHostConfiguration failed

arch-wasmWebAssembly architectureWebAssembly architecture

area-VM-meta-mono

needs-author-actionAn issue or pull request that requires more info or actions from the author.An issue or pull request that requires more info or actions from the author.

os-browserBrowser variant of arch-wasmBrowser variant of arch-wasm

Status: Open.

#128495 In dotnet/runtime;

· LuisPignataro opened on May 22, 2026

[release/10.0] Fix UnsafeAccessor signature for byref struct this

area-System.Runtime.InteropServices

Servicing-approvedApproved for servicing releaseApproved for servicing release

Status: Open (in progress).

dotnet/runtimenumber 128851

#128851 In dotnet/runtime;

· github-actions opened on Jun 1, 2026

[release/10.0] Fix NativeAOT string GC config handling

area-NativeAOT-coreclr

Servicing-approvedApproved for servicing releaseApproved for servicing release

Status: Open (in progress).

dotnet/runtimenumber 128894

#128894 In dotnet/runtime;

· github-actions opened on Jun 2, 2026

[release/10.0] Fix crash on calling COM interface method on a class where a derived class overriding it was created first

area-Interop-coreclr

Servicing-approvedApproved for servicing releaseApproved for servicing release

Status: Open (in progress).

dotnet/runtimenumber 128796

#128796 In dotnet/runtime;

· elinor-fung opened on May 30, 2026