Issues

• Bundled zlib is compiled without optimisation in release builds

  confluentinc/librdkafka#5673 · Filter by author molostovvs opened on Nov 15, 2026

• Since 2.16.0, a client whose brokers are all down reconnects every ~50 ms: re-bootstrap resets the reconnect backoff

  confluentinc/librdkafka#5665 · Filter by author peterdukelarsen opened on Nov 2, 2026

• Test suite build and run issues on FreeBSD

  confluentinc/librdkafka#5663 · Filter by author mzary opened on Nov 1, 2026
  3

• Consider generating static release archives

  confluentinc/librdkafka#5662 · Filter by author diizzyy opened on Nov 1, 2026

• rdkafka.h: const int return type of rd_kafka_TopicPartitionInfo_partition() breaks builds with -Wextra -Werror

  confluentinc/librdkafka#5661 · Filter by author tjarross opened on Oct 30, 2026

• Confluent.Kafka 2.16.0 ships OpenSSL 3.6.3 affected by CVE-2026-75803 and CVE-2026-84782

  confluentinc/librdkafka#5660 · Filter by author NickeSEB opened on Oct 30, 2026

• Share consumer: ShareConsumer#close hangs on a late first assignment

  confluentinc/librdkafka#5658 · Filter by author mensfeld opened on Oct 29, 2026

• KIP-848 notes say "do not use rd_kafka_assign() or other assignment APIs"; incremental APIs are required and assign() is fine before subscribe

  confluentinc/librdkafka#5655 · Filter by author hidingmyname opened on Oct 27, 2026

• Mock cluster: TxnOffsetCommit is acknowledged but never stored, and its member is never validated

  confluentinc/librdkafka#5652 · Filter by author Jarv1s10 opened on Oct 24, 2026

• Compilation broken on uClibc based toolchains.

  confluentinc/librdkafka#5650 · Filter by author ThomasDevoogdt opened on Oct 24, 2026

• Crash (Stack overflow) in rd_kafka_metadata_cache_insert()

  confluentinc/librdkafka#5648 · Filter by author THUXGF opened on Oct 24, 2026

• Classic consumer stays in join-state wait-metadata until topic.metadata.refresh.interval.ms when its "consumer join" Metadata request is lost to a broker decommission (routine in 2.16.0 when the consumer starts during broker start-up)

  confluentinc/librdkafka#5647 · Filter by author atzoum opened on Oct 22, 2026

• BUG: rd_kafka_buf_finalize_arraycnt varint overflow causes silent protocol corruption

  confluentinc/librdkafka#5645 · Filter by author ysherma opened on Oct 21, 2026

• Dangling rk->rk_mock.cluster back-pointer causes use-after-free in rd_kafka_destroy after explicit rd_kafka_mock_cluster_destroy

  confluentinc/librdkafka#5644 · Filter by author paopaolin opened on Oct 21, 2026

• Intermittent RD_KAFKA_RESP_ERR__ALL_BROKERS_DOWN on librdkafka with AWS MSK

  confluentinc/librdkafka#5643 · Filter by author isma3ilovich opened on Oct 19, 2026
  1

• Unconnected broker threads wake up every second: measurable CPU with many clients on large clusters

  confluentinc/librdkafka#5639 · Filter by author atsarevskiy opened on Oct 15, 2026

• crc32c: add hardware CRC-32C on AArch64 (ARMv8 CRC32 instructions)

  confluentinc/librdkafka#5637 · Filter by author atsarevskiy opened on Oct 14, 2026

• Windows NuGet packages ship non-LTS OpenSSL 3.6 (EOL 2026-11-01) while other platforms get 3.5 LTS

  confluentinc/librdkafka#5635 · Filter by author micgruber opened on Oct 12, 2026

• Subtracting rktp_msgs_inflight from RD_KAFKA_IDEMP_MAX_INFLIGHT request limit incorrectly caps/throttles requests

  bug
  confluentinc/librdkafka#5632 · Filter by author andreascasapu opened on Oct 8, 2026
  

• librdkafka.redist 2.16.0: linux-arm64 alpine-librdkafka.so now depends on libsasl2.so.3

  bug
  confluentinc/librdkafka#5630 · Filter by author GBNikola opened on Oct 8, 2026
  1

• Producer partition can remain on a non-leader broker thread after a leader change with the same epoch

  confluentinc/librdkafka#5629 · Filter by author r0mdau opened on Oct 7, 2026

• KIP-848: unsubscribe during a pending incremental revoke strands the consumer at epoch 0: fatal INVALID_REQUEST on resubscribe, or no rejoin

  status:waiting-for-interest
  confluentinc/librdkafka#5623 · Filter by author pdeva opened on Oct 5, 2026
  1

• 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