Issues

• Performance degradation : NameAwareGenericData adds a per-field HashMap lookup and raises generic Avro serialize CPU by about 10%

  confluentinc/schema-registry#4639 · Filter by author rao2100 opened on Sep 30, 2026

• kafka-avro-serializer 8.3.2: DatumReaderKey caches by bare schema id, ignoring schema-registry context → wrong reader reused, corrupt deserialization (AvroTypeException)

  confluentinc/schema-registry#4620 · Filter by author mrickly opened on Sep 25, 2026
  2

• kafka-schema-registry-client can flood connections/retries during SR incidents — needs safer defaults

  confluentinc/schema-registry#4588 · Filter by author stokpop opened on Sep 16, 2026

• kafka-avro-serializer 8.3.0 - uses unsafe guava32.0.1

  confluentinc/schema-registry#4549 · Filter by author mortenbj-statnett opened on Sep 1, 2026

• Support for OAuth 2 Workload Identity in Schema Registry Client

  confluentinc/schema-registry#4497 · Filter by author sgpbyrne opened on Aug 13, 2026

• Protobuf parser rejects valid nested extension syntax in custom options

  confluentinc/schema-registry#4470 · Filter by author tmanninger opened on Jul 31, 2026
  2

• Orphan _schemas keys after hard delete: legacy key byte format survives compaction and resurrects schemas on Schema Registry restart

  confluentinc/schema-registry#4420 · Filter by author YauheniMakar opened on Jul 13, 2026

• Failed to collect dependencies at io.confluent:kafka-avro-serializer:jar:7.8.8

  confluentinc/schema-registry#4379 · Filter by author fbiville opened on Jun 16, 2026
  1

• Optimize Json and Avro deserializers – use byte array with offset/size from ByteBuffer.array()

  confluentinc/schema-registry#4327 · Filter by author didvdk opened on May 25, 2026

• SASL_OAUTHBEARER_INHERIT doesn't work with direct authorization properties

  confluentinc/schema-registry#4248 · Filter by author AleksandraKobusinska opened on Apr 14, 2026

• OpenAPI spec YAML file distribution

  confluentinc/schema-registry#4222 · Filter by author koalalam opened on Mar 26, 2026

• High CPU utilization when migrating to "consumer" group protocols. ( 8.1.1 and 8.2.0)

  confluentinc/schema-registry#4188 · Filter by author uananth opened on Mar 9, 2026

• kafka-json-serializer 8.2.0 -> GHSA-72hv-8253-57qq, Score: 7.5

  confluentinc/schema-registry#4181 · Filter by author patpatpat123 opened on Mar 4, 2026

• Protobuf exception using Connect Protobuf converter, due to mistaken use of Protobuf 3: Type 'com/google/protobuf/DescriptorProtos$EnumValueOptions' (current frame, stack[1]) is not assignable to 'com/google/protobuf/GeneratedMessage$ExtendableMessage'

  confluentinc/schema-registry#4133 · Filter by author james-johnston-thumbtack opened on Feb 13, 2026

• Incorrect handling of default values for union fields (Avro spec mismatch)

  confluentinc/schema-registry#4112 · Filter by author rudikone opened on Jan 30, 2026
  4

• Schema Registry giving 401 error

  confluentinc/schema-registry#4109 · Filter by author shankar0909 opened on Jan 26, 2026

• Add support for Headers

  confluentinc/schema-registry#4075 · Filter by author skecskes opened on Jan 6, 2026

• MockSchemaRegistryClient now throws IllegalStateException: Invalid schema type JSON

  confluentinc/schema-registry#4057 · Filter by author Zordid opened on Dec 10, 2025
  1

• Add findTags query param to /schemas & /subjects endpoints

  confluentinc/schema-registry#4044 · Filter by author jsingh-yelp opened on Dec 5, 2025

• cannot set org.apache.kafka.sasl.oauthbearer.allowed.urls in schema registry container in k8s

  confluentinc/schema-registry#4037 · Filter by author KyriosGN0 opened on Nov 30, 2025
  1

• Allow passing auth as function

  confluentinc/schema-registry#4035 · Filter by author slukes opened on Nov 24, 2025

• Protobuf field presence tracking is broken for editions 2023 and 2024.

  confluentinc/schema-registry#3925 · Filter by author ubiquitousbyte opened on Oct 5, 2025
  3

• Endpoint to list all configured aliases

  confluentinc/schema-registry#3919 · Filter by author schulzrol opened on Oct 1, 2025
  4

• Different Schema Registries intended to be isolated are working in a leader-slave relationship

  confluentinc/schema-registry#3883 · Filter by author HarshKumar17 opened on Sep 4, 2025

• When is the release date for V8.2.X

  confluentinc/schema-registry#3879 · Filter by author ramesh4593 opened on Sep 2, 2025
  1