List view

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

area-ExceptionHandling-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

JIT: boxing shouldn't be removed for escaping managed references

area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMICLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

Status: Open.

#122099 In dotnet/runtime;

· EgorBo opened on Dec 2, 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

[release/10.0] [browser] Generate boot config with hash field instead of integrity

arch-wasmWebAssembly architectureWebAssembly architecture

area-Build-mono

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

Servicing-considerIssue for next servicing release reviewIssue for next servicing release review

Status: Open (in progress).

dotnet/runtimenumber 122391

#122391 In dotnet/runtime;

· maraf opened on Dec 10, 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 <code>ProfileOptimization.StartProfile</code>

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

[release/10.0] Deny unmasked frame receive for WebSocket Server

area-System.Net

Servicing-considerIssue for next servicing release reviewIssue for next servicing release review

Status: Open (in progress).

dotnet/runtimenumber 123660

#123660 In dotnet/runtime;

· github-actions opened on Jan 27, 2026

[release/10.0] <code>PersistedAssemblyBuilder</code>: Fix encoding of custom modifiers. (#123925)

area-System.Reflection.Emit

Status: Open (in progress).

dotnet/runtimenumber 124537

#124537 In dotnet/runtime;

· jkotas opened on Feb 18, 2026

[release/10.0] Fix certificate disposal in RemoteCertificateValidationCallback causing NRE on reuse

area-System.Net.Security

Status: Open (in progress).

dotnet/runtimenumber 124584

#124584 In dotnet/runtime;

· github-actions opened on Feb 19, 2026