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RequiredRuntimeAttribute is ignored and could be deleted

Status: Open.

#13046 In dotnet/msbuild;

· rainersigwald opened on Jan 16, 2026

Refactor Microsoft.IO APIs usage.

Status: Open.

#13041 In dotnet/msbuild;

· AR-May opened on Jan 16, 2026

<code>Microsoft.Build.Framework</code> should produce an error when consumed by net9.0 project or earlier

Area: DocumentationIssues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)Issues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)

Status: Open.

#13034 In dotnet/msbuild;

· Youssef1313 opened on Jan 15, 2026

Document the different values of TaskFactory

Area: DocumentationIssues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)Issues about docs, including errors and areas we should extend (this repo and learn.microsoft.com)

Status: Open.

#13029 In dotnet/msbuild;

· ViktorHofer opened on Jan 14, 2026

Determine which usages of ConcurrentDictionary cause contention in multithreaded mode

Area: Multithreaded

Area: Performance

Status: Open.

Task

#13028 In dotnet/msbuild;

· baronfel opened on Jan 14, 2026

Document that in MT mode Custom Task Factories are not supported

Area: Multithreaded

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

Breaking Change

Status: Open.

Task

#13026 In dotnet/msbuild;

· baronfel opened on Jan 14, 2026

Transfer all other uninteresting Tasks to the new API

Area: Multithreaded

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.

Task

#13025 In dotnet/msbuild;

· baronfel opened on Jan 14, 2026

Add ability for Perfstar to create and collect dumps from test runs

Status: Open.

Feature

#13024 In dotnet/msbuild;

· baronfel opened on Jan 14, 2026

Add Support for Repo‑Local MSBuild SDKs via <code>.msbuild/Sdk/&lt;SdkName&gt;/</code>

Status: Open.

Feature

#13017 In dotnet/msbuild;

· ocalvo opened on Jan 14, 2026

MSBuild C# custom task throws MissingMethodException

author-respondedAuthor responded, needs response from dev team.Author responded, needs response from dev team.

Status: Open.

#13015 In dotnet/msbuild;

· MarcelVersteeg opened on Jan 13, 2026

TaskHostFactory doesn't terminate nodes anymore with a 11.0 SDK

Status: Open.

#13013 In dotnet/msbuild;

· ViktorHofer opened on Jan 13, 2026

Race condition in TaskRegistry in /mt mode

Area: Multithreaded

Area: PerfStarIssues related to our PerfStar tool. That measures MSBuild performance.Issues related to our PerfStar tool. That measures MSBuild performance.

bug

Status: Open.

#13008 In dotnet/msbuild;

· AR-May opened on Jan 12, 2026