Issues

• Consider refactoring MutationControl

  Area: MTP RunnerArea: Mutation TestArea: VsTest RunnerFeat: Coverage Analysis🚀 Feature requestPriority: Low
  Feature

  stryker-mutator/stryker-net#3879 · Filter by author dupdob opened on Oct 1, 2026

• Coverage performance: repeated locked linear membership checks in hot validation loops (4.16.0)

  AI assistedFeat: Coverage AnalysisPriority: Medium
  Feature

  stryker-mutator/stryker-net#3878 · Filter by author chrisdpurcell opened on Sep 30, 2026
  6

• Configurable S3 storage options for baselines (Cloudflare R2 support)

  🚀 Feature request
  stryker-mutator/stryker-net#3873 · Filter by author hojmark opened on Sep 28, 2026
  1

• Interpolated Regex pattern causes InvalidCastException

  Area: Mutator🐛 BugPriority: High
  stryker-mutator/stryker-net#3872 · Filter by author EraYaN opened on Sep 28, 2026
  2

  

• MTP perTest coverage: after one test times out during coverage capture, every later test of the assembly is marked Dubious ("Timed out waiting for coverage relay ack")

  stryker-mutator/stryker-net#3871 · Filter by author procksha opened on Sep 28, 2026

• Add pull request title validation pipeline

  🚀 Feature requesthacktoberfest
  stryker-mutator/stryker-net#3863 · Filter by author rouke-broersma opened on Sep 25, 2026

• Allow library consumers to customize Stryker Core service registrations

  stryker-mutator/stryker-net#3858 · Filter by author georgreen opened on Sep 21, 2026
  4

• Use IBlockingDataConsumer for MTP per-test coverage

  AI assistedArea: MTP Runner🚀 Feature request
  stryker-mutator/stryker-net#3855 · Filter by author Evangelink opened on Sep 16, 2026

• test-case-filter not working with MTP

  🐛 Bug
  stryker-mutator/stryker-net#3843 · Filter by author bkaidbb opened on Sep 14, 2026
  2

• 5.0.0 under-reports kills nondeterministically under mtp with concurrency > 1 (regression from 4.16.0)

  AI assistedArea: Mutation Test
  stryker-mutator/stryker-net#3832 · Filter by author dclark-olm opened on Sep 11, 2026
  5

• CoverageBasedTest misses recently added tests in coveredBy, marking killable mutants as Survived

  AI assisted🐛 Bug! Need more info !
  stryker-mutator/stryker-net#3815 · Filter by author im47cn-bot opened on Aug 31, 2026
  1

• mutate span filters in stryker-config.json are silently ignored (CLI -m works)

  AI assistedArea: Filters! Need more info !
  stryker-mutator/stryker-net#3814 · Filter by author im47cn-bot opened on Aug 31, 2026
  1

• Stryker should explicitly surface compiler version issue with Blazor/Razor

  AI assistedArea: Compiling🐛 Bug
  stryker-mutator/stryker-net#3813 · Filter by author dclark-olm opened on Aug 28, 2026
  8

  

• Stryker crashes dotnet runtime with MTP and concurrent testing on MacOS

  🐛 Bug
  stryker-mutator/stryker-net#3812 · Filter by author richardwerkman opened on Aug 28, 2026
  1

• Integration test validation asserts aggregate mutant counts, which hide what changed

  🚀 Feature request
  stryker-mutator/stryker-net#3797 · Filter by author fabio-dev opened on Aug 22, 2026

• Improve support for multi targeting projects

  Area: Initialization🚀 Feature request
  stryker-mutator/stryker-net#3794 · Filter by author dupdob opened on Aug 21, 2026
  

• Project analysis fails ("No project found") unless TargetFramework is written literally in the test .csproj — an inherited or $(…)-referenced value is not seen

  AI assistedArea: Mutation TestArea: VsTest Runner🐛 Bug! Need more info !
  stryker-mutator/stryker-net#3758 · Filter by author PhilipThyregod opened on Aug 4, 2026
  14

• Nondeterministic crash in solution mode: ArgumentException 'Destination is too short' in InputFileResolver.AnalyzeAllNeededProjects (4.16.0)

  stryker-mutator/stryker-net#3746 · Filter by author martinmdrive opened on Jul 28, 2026
  1

• mtp runner lacks on option to test each mutant in its own process

  AI assistedArea: MTP Runner🚀 Feature request
  stryker-mutator/stryker-net#3742 · Filter by author gem4511 opened on Jul 25, 2026
  19

• Progress reporter showing progress of coverage analysis

  Area: Mutation Test🚀 Feature request
  stryker-mutator/stryker-net#3728 · Filter by author richardwerkman opened on Jul 19, 2026

• Crash: HashSet corruption in MutationTestProcess.OnMutantTested under --concurrency > 1 (data race on reportedMutants)

  stryker-mutator/stryker-net#3727 · Filter by author anagnorisis2peripeteia opened on Jul 18, 2026
  5

• JsonReport breaks schema rules on filepaths

  🐛 Bug
  stryker-mutator/stryker-net#3725 · Filter by author rouke-broersma opened on Jul 18, 2026

• since: every changed file is logged at Information level — tens of thousands of log lines and real overhead on large diffs

  stryker-mutator/stryker-net#3718 · Filter by author martinmdrive opened on Jul 16, 2026
  1

• --since / --with-baseline resolves the target branch by substring match and can silently diff against the wrong branch

  stryker-mutator/stryker-net#3717 · Filter by author martinmdrive opened on Jul 16, 2026
  1

• Stryker can't analyze a WPF project with local-type XAML under the .NET 10 SDK (works under the .NET 8 SDK)

  stryker-mutator/stryker-net#3701 · Filter by author anagnorisis2peripeteia opened on Jul 10, 2026
  9