Issues

• Announcement: v4 preview.2, and the repository moving to Cysharp at v4 release

  MessagePack-CSharp/MessagePack-CSharp#2316 · Filter by author neuecc opened on Oct 30, 2026

• MessagePackReader.Try* methods not throwing exceptions

  question
  MessagePack-CSharp/MessagePack-CSharp#2311 · Filter by author vborovikov opened on Oct 18, 2026
  3

• [GLD Serializer Benchmark] C# MessagePack-CSharp 2.5.302 — spec compliance misses

  MessagePack-CSharp/MessagePack-CSharp#2299 · Filter by author leo-gan opened on Sep 14, 2026
  1

• Add ExcludeFromCodeCoverage attribute to generated code.

  MessagePack-CSharp/MessagePack-CSharp#2297 · Filter by author SergeyBarskiyTyler opened on Sep 11, 2026
  2

• Missing .meta files cause Unity to reject the MessagePack package

  MessagePack-CSharp/MessagePack-CSharp#2292 · Filter by author Ecconia opened on Aug 14, 2026

• IntelliSense error due to MessagePack source generator

  MessagePack-CSharp/MessagePack-CSharp#2289 · Filter by author deepakSinghCodes opened on Aug 5, 2026

• Generator and analyzer crash with IndexOutOfRangeException on a closed generic struct from a referenced assembly

  MessagePack-CSharp/MessagePack-CSharp#2283 · Filter by author alexyakunin opened on Jul 27, 2026

• Digitally sign release assemblies

  MessagePack-CSharp/MessagePack-CSharp#2277 · Filter by author jasonwnz opened on Jul 1, 2026
  4

• TryReadMapHeader throws OverflowException

  MessagePack-CSharp/MessagePack-CSharp#2276 · Filter by author karim-kaylani-sh opened on Jun 16, 2026
  2

• MessagePackWriter Write(in ReadOnlySpan<byte> src) input should be scoped

  MessagePack-CSharp/MessagePack-CSharp#2252 · Filter by author ShadowMarker789 opened on Mar 20, 2026
  3

• CS0433 type conflict when using MessagePack v3.1.4 in Unity buildtime.

  unity
  MessagePack-CSharp/MessagePack-CSharp#2248 · Filter by author GomPam opened on Jan 8, 2026
  5

• MessagePack source generators causes compiler error inside WPF XAML user control library projects

  MessagePack-CSharp/MessagePack-CSharp#2243 · Filter by author bitbonk opened on Nov 24, 2025

• Consider providing a big-endian Guid formatter

  MessagePack-CSharp/MessagePack-CSharp#2240 · Filter by author adrianotr opened on Nov 8, 2025

• In Unity, the first call to MessagePackSerializer.SerializeToJson is very slow.

  unity
  MessagePack-CSharp/MessagePack-CSharp#2239 · Filter by author baiyufei opened on Nov 7, 2025
  1

• asp core - output formatter warning

  MessagePack-CSharp/MessagePack-CSharp#2238 · Filter by author amirreza-sf80 opened on Nov 5, 2025

• Failed to serialize as List<[MessagePackObject]> With Union

  unity
  MessagePack-CSharp/MessagePack-CSharp#2237 · Filter by author moesionadel opened on Nov 2, 2025
  1

• The analyzer does not work if SuppressSourceGeneration = true

  MessagePack-CSharp/MessagePack-CSharp#2234 · Filter by author LavrinenkoRuslan opened on Oct 17, 2025

• Missing MsgPack003 error when using class from other project

  analyzer
  MessagePack-CSharp/MessagePack-CSharp#2233 · Filter by author treziac opened on Oct 10, 2025
  2

• Cannot deserialize byte[] in class

  MessagePack-CSharp/MessagePack-CSharp#2230 · Filter by author kukuro-kt opened on Sep 12, 2025
  2

• MessagePackSerializer.DeserializeAsync blocks for a complete read

  MessagePack-CSharp/MessagePack-CSharp#2229 · Filter by author znakeeye opened on Sep 9, 2025
  3

• MessagePack 3.1 doesn't create formatters for abstract base classes unless they include MessagePackObjectAttribute

  MessagePack-CSharp/MessagePack-CSharp#2219 · Filter by author abond-sd opened on Aug 7, 2025

• MessagePack 3.1 doesn't serialize or deserialize keys in custom collections

  MessagePack-CSharp/MessagePack-CSharp#2218 · Filter by author abond-sd opened on Aug 5, 2025

• Using MessagePack with DataContract Annotation

  MessagePack-CSharp/MessagePack-CSharp#2217 · Filter by author 1knueller opened on Aug 4, 2025
  1

• Support for readonly collections from Collection expressions

  MessagePack-CSharp/MessagePack-CSharp#2216 · Filter by author Lyphion opened on Aug 4, 2025
  3

• Attribute [NonSerialized] not omitted

  MessagePack-CSharp/MessagePack-CSharp#2214 · Filter by author urosberce opened on Jul 31, 2025
  3