Issues

• Share consumer: records acquired by an in-flight fetch stay locked after rd_kafka_share_unsubscribe()

  confluentinc/librdkafka#5621 · Filter by author mensfeld opened on Oct 2, 2026

• Share consumer: async acknowledgements merged out of order are rejected with INVALID_REQUEST

  confluentinc/librdkafka#5620 · Filter by author mensfeld opened on Oct 1, 2026

• Share consumer: (rd_kafka_share_t) exposes no way to read the client name

  confluentinc/librdkafka#5619 · Filter by author mensfeld opened on Sep 30, 2026

• Idempotent producer: broker thread spins with zero-timeout polls while a partition is at the in-flight cap (next_wakeup lowered to now before the cap is applied)

  confluentinc/librdkafka#5617 · Filter by author xin-liu-au opened on Sep 29, 2026

• consumer_close() blocks for the whole rebalance when called mid-round

  confluentinc/librdkafka#5612 · Filter by author patrickdemers6 opened on Sep 25, 2026
  

• Utilize streaming decompression for zstd in the consumer

  confluentinc/librdkafka#5595 · Filter by author wmorgan6796 opened on Sep 16, 2026

• builtin regexp: lexcount overflow → heap-buffer-overflow WRITE in emit (sibling of #3597)

  confluentinc/librdkafka#5594 · Filter by author liuyi1231 opened on Sep 15, 2026

• Support client-side throttling (KIP-219)

  status:planned
  confluentinc/librdkafka#5592 · Filter by author chuck-alt-delete opened on Sep 14, 2026

• Consumer pause-assign-resume may leave some partitions permanently paused

  confluentinc/librdkafka#5591 · Filter by author gkozar opened on Sep 10, 2026
  1

• OffsetFetch request-level NOT_COORDINATOR leaves partition in .queried; fetcher never starts and never retries

  confluentinc/librdkafka#5586 · Filter by author du-do opened on Sep 5, 2026
  1

• [Security] Broker-controlled response parsing: pre-auth SIGSEGV via nullable array -1 (default-enabled), share-consumer error fan-out OOM, SASL SCRAM pre-auth stack exhaustion

  security
  confluentinc/librdkafka#5577 · Filter by author afldl opened on Aug 24, 2026

• OIDC client_credentials token request does not include audience parameter

  enhancementstatus:planned
  Feature

  confluentinc/librdkafka#5571 · Filter by author paulotovo opened on Aug 13, 2026

• Classic consumer abandons the member id assigned by the broker (KIP-394), stalling the group for session.timeout.ms

  confluentinc/librdkafka#5569 · Filter by author delthas opened on Aug 13, 2026

• Upgrade bundled libcurl to >= 8.21.0

  security
  Task

  confluentinc/librdkafka#5567 · Filter by author NexiSSSSS opened on Aug 13, 2026
  5

• Support message headers in rd_kafka_produce_batch()

  enhancementstatus:waiting-for-interest
  Feature

  confluentinc/librdkafka#5559 · Filter by author Lancetnik opened on Aug 4, 2026
  

• Clang CFI icall type mismatch in rd_list_remove_cmp and string comparators

  Bug

  confluentinc/librdkafka#5558 · Filter by author EricFXU opened on Jul 28, 2026
  

• Make OpenTelemetry support a build-time optional

  enhancementstatus:waiting-for-interest
  confluentinc/librdkafka#5553 · Filter by author dholm opened on Jul 23, 2026
  

• Snappy disabled by default with vcpkg

  confluentinc/librdkafka#5531 · Filter by author martenmh opened on Jun 24, 2026

• Permanent CPU degradation and bloated Producer statistics JSON after pod overlap during deployment

  confluentinc/librdkafka#5528 · Filter by author daniel-petrov-flows opened on Jun 23, 2026

• rd_kafka_send_offsets_to_transaction() hangs when the group coordinator is decommissioned

  Bug

  confluentinc/librdkafka#5511 · Filter by author morgando opened on Jun 18, 2026

• Data loss consuming legacy (magic v0/v1) message-format topics over flexible Fetch

  status:under-review
  confluentinc/librdkafka#5504 · Filter by author giuseppelillo opened on Jun 16, 2026
  1

• Support for KIP-664: Admin API for detecting and aborting hanging transactions

  status:planned
  confluentinc/librdkafka#5497 · Filter by author mlongob opened on Jun 12, 2026

• Potential deadlock / lock-order inversion between rkb_lock and rktp_lock

  confluentinc/librdkafka#5490 · Filter by author hanqing2025 opened on Jun 11, 2026

• Deadlock: rd_kafka_destroy hangs on rk_wrlock — rk_lock<->toppar lock-order inversion (toppar_forget_leader vs OffsetForLeaderEpoch leader-query) when a broker is unreachable

  confluentinc/librdkafka#5476 · Filter by author travisdowns opened on Jun 2, 2026
  2

• rd_kafka_send_offsets_to_transaction() ignores timeout

  Bug

  confluentinc/librdkafka#5456 · Filter by author morgando opened on May 20, 2026