- [fix][sec][branch-4.0] Upgrade Jackson version to 2.18.9 (#26187)
- [fix][sec][branch-4.0] Upgrade Netty to 4.1.136.Final (#26170)
- [fix][client] Fix lookup permit double-release, waiting queue starvation and timeout-response races in ClientCnx (#26143)
- [fix][client] Fix lookup request semaphore not release problem (#25038)
- [fix][client] Fix UnAckedMessageRedeliveryTracker to skip cancelled timeouts (#26043)
- [fix][client] Fix unAckedMessageTracker cleanup on multi-topics batch ack (#26001)
- [fix][client] Preserve null values in pulsar-admin schema output (#26196)
- [fix][client] Sync ackSet in client with broker to stop acked messages reaching the DLQ (#26135)