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Race condition in GetTaskHostNameFromHostContext causes ArgumentNullException in multithreaded builds

Status: Open.

#13484 In dotnet/msbuild;

· AR-May opened on Apr 2, 2026

MSBuild .up2date files can permanently hork U2D check in VS

Status: Open.

Bug

#13478 In dotnet/msbuild;

· AArnott opened on Apr 1, 2026

GetCopyToOutputDirectoryItemsDependsOn overwrites previous value instead of appending to it

Status: Open.

#13471 In dotnet/msbuild;

· snechaev opened on Mar 31, 2026

[ADO] Excessive msbuild.exe tasks when loading a solution

Area: Solution (.sln)Issues related to parsing .sln files or building solutionsIssues related to parsing .sln files or building solutions

Status: Open.

#13470 In dotnet/msbuild;

· MichalPavlik opened on Mar 31, 2026

MSBuild Release Checklist 18.6

Status: Open.

#13468 In dotnet/msbuild;

· MichalPavlik opened on Mar 31, 2026

MsBuild using last write time of symlinks instead of their targets to determine whether or not to rebuild

Priority:2Work that is important, but not critical for the releaseWork that is important, but not critical for the release

triaged

Status: Open.

Bug

#13465 In dotnet/msbuild;

· DiegoBaldassarMilleuno opened on Mar 30, 2026

Reënable Apphost for worker nodes

.NET Core

Area: NetSDK

Area: Performance

Partner:NuGet

Priority:1Work that is critical for the release, but we could probably ship withoutWork that is critical for the release, but we could probably ship without

triaged

Status: Open.

#13464 In dotnet/msbuild;

· rainersigwald opened on Mar 30, 2026

Copy Task on macOS Copy-on-Write filesystems is not resilient to concurrent copies

Area: TasksIssues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.Issues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.

triaged

Status: Open.

Bug

#13463 In dotnet/msbuild;

· baronfel opened on Mar 30, 2026

Consider building a 'bare' directory

Area: ApplicationIssues with `msbuild.exe` or the CLI experience.Issues with `msbuild.exe` or the CLI experience.

needs-designRequires discussion with the dev team before attempting a fix.Requires discussion with the dev team before attempting a fix.

Status: Open.

Feature

#13456 In dotnet/msbuild;

· baronfel opened on Mar 27, 2026

Migrate SGen Task to TaskEnvironment API

Area: TasksIssues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.Issues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.

Status: Open.

#13455 In dotnet/msbuild;

· OvesN opened on Mar 27, 2026

MSBuild v18 truncates configuration names with spaces when passing to Project References

Status: Open.

Bug

#13453 In dotnet/msbuild;

· jimpark opened on Mar 27, 2026

Migrate ToolTask task to TaskEnvironment API

Area: TasksIssues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.Issues impacting the tasks shipped in Microsoft.Build.Tasks.Core.dll.

Status: Open.

#13447 In dotnet/msbuild;

· OvesN opened on Mar 25, 2026