12.0.0

Issues

• JIT: (bug) NativeAOT: variable-offset load from preinitialized static readonly struct folded as offset 0

  area-CodeGen-coreclr
  dotnet/runtime#134488 · Filter by author EgorBo opened on Sep 23, 2026 · 12.0.0
  3

• Test failure: GC/Features/HeapExpansion/bestfit-finalize/bestfit-finalize.cmd

  area-CodeGen-coreclrblocking-clean-ci-optionalblocking-outerloopKnown Build Error
  dotnet/runtime#132107 · Filter by author VincentBu opened on Aug 11, 2026 · 12.0.0
  4

  

• Async2TaskAdapters.TestValueTaskOfTaskValueVersusAsync fails with SanityCheck() in Wasm R2R test

  arch-wasmarea-VM-coreclrblocking-clean-ciKnown Build Errorruntime-async
  dotnet/runtime#133953 · Filter by author AndyAyersMS opened on Sep 15, 2026 · 12.0.0
  5

  

• WebProxy's BypassProxyOnLocal domain detection could be improved

  area-System.Netbug
  dotnet/runtime#132842 · Filter by author MihaZupan opened on Aug 27, 2026 · 12.0.0
  3

  

• [wasm] R2R: 32-byte struct passed by value is corrupted (fields shifted by one word)

  arch-wasmarea-CodeGen-coreclr
  dotnet/runtime#131639 · Filter by author pavelsavara opened on Jul 31, 2026 · 12.0.0
  7

  

• ML-DSA support on CryptoKit

  area-System.Securityos-iosos-macosos-tvos
  dotnet/runtime#120550 · Filter by author vcsjones opened on Oct 8, 2025 · 12.0.0
  5

  

• Support SHA-3 on Apple CryptoKit

  area-System.Security
  Feature

  dotnet/runtime#116511 · Filter by author vcsjones opened on Jun 11, 2025 · 12.0.0
  4

• Replace deprecated SecTrustGetCertificateAtIndex API in System.Security.Cryptography.Native.Apple

  area-System.Securityos-iosos-maccatalystos-macosos-tvos
  dotnet/runtime#101349 · Filter by author akoeplinger opened on Apr 21, 2024 · 12.0.0
  7

• ML-KEM: CryptoKit support

  area-System.Securityblocked
  Task

  dotnet/runtime#116454 · Filter by author vcsjones opened on Jun 10, 2025 · 12.0.0
  5

  

• Add back ILLink usage of dependency analysis framework

  area-Tools-ILLink
  dotnet/runtime#105159 · Filter by author sbomer opened on Jul 19, 2024 · 12.0.0
  2

  

• [ci-scan] Test failure: InvokeWithRefLikeArgs.MethodTakesRefToRefStructAsArg_ThrowsNSE on iossimulator

  agentic-workflowsarea-System.Reflection.EmitKnown Build Erroros-ios
  dotnet/runtime#129358 · Filter by author github-actions opened on Jun 13, 2026 · 12.0.0
  5

• SIGSEGV in mono_interp_exec_method on iOS with UseInterpreter=true (.NET 10)

  area-Codegen-Interpreter-monoos-ios
  dotnet/runtime#126448 · Filter by author rbakhshi opened on Apr 2, 2026 · 12.0.0
  7

  

• Add tests for DataContractSerializer serializing System.Globalization types

  area-Serializationin-prtest-enhancement
  dotnet/runtime#24358 · Filter by author huanwu opened on Dec 5, 2017 · 12.0.0
  3

• Add tests for DataContractSerializer serializing collection types

  area-Serializationin-prtest-enhancement
  dotnet/runtime#24355 · Filter by author huanwu opened on Dec 5, 2017 · 12.0.0
  3

• Improve code coverage for System.Xml.Serialization

  area-Serializationtest-enhancement
  dotnet/runtime#1415 · Filter by author sepidehkh opened on Mar 3, 2017 · 12.0.0
  5

• Generated XmlSerializers DLL (from Microsoft.XmlSerializer.Generator) cause FileNotFoundException when used in COM host

  area-Serialization
  dotnet/runtime#64608 · Filter by author MD-V opened on Feb 1, 2022 · 12.0.0
  

• XmlSerializer.GenerateSerializer should not be in System.Private.Xml

  area-Serialization
  dotnet/runtime#1413 · Filter by author stephentoub opened on Sep 19, 2019 · 12.0.0
  6

  

• XmlSerializerGenerator duplicates code in System.Private.Xml

  area-Serialization
  dotnet/runtime#56589 · Filter by author StephenMolloy opened on Jul 29, 2021 · 12.0.0

• Microsoft.XmlSerializer.Generator returns warnings with the .NET 6 and 7 SDK

  area-Serialization
  dotnet/runtime#74310 · Filter by author mcpat-it opened on Aug 21, 2022 · 12.0.0
  2

  

• Microsoft.XmlSerializer.Generator fails to generate serializer for assemblies not targeting netstandard2.0

  area-Serialization
  dotnet/runtime#630 · Filter by author mconnew opened on Dec 6, 2019 · 12.0.0
  2

  

• Microsoft.XmlSerializer.Generator 5.0.0 does not work with WCF Core 3.2.1

  area-Serialization
  dotnet/runtime#58421 · Filter by author kornelpal opened on Aug 31, 2021 · 12.0.0
  4

  

• Code for serialization using sgen makes use of single file dangerous patterns

  area-Serialization
  dotnet/runtime#50820 · Filter by author tlakollo opened on Apr 6, 2021 · 12.0.0
  1

  

• Microsoft.XmlSerializer.Generator added *.XmlSerialization.all to nuget package which causes CS0436

  area-Serialization
  dotnet/runtime#107288 · Filter by author TiltonJH opened on Sep 3, 2024 · 12.0.0
  1

• Microsoft.XmlSerializer.Generator not working with any .NET Standard 2.0 library

  area-Serialization
  dotnet/runtime#83765 · Filter by author topsterde opened on Mar 22, 2023 · 12.0.0
  2

• Microsoft.XmlSerializer.Generator adds DotNetCliToolReference to project

  area-Serialization
  dotnet/runtime#69435 · Filter by author zivkan opened on May 17, 2022 · 12.0.0
  6