Issues

• Even when msg.AckSync() returns success, if standalone server is killed the Ack may not be stored and the message may be resent to the durable consumer

  defect
  nats-io/nats-server#8821 · Filter by author codyps opened on Nov 1, 2026

• Add publishing groups for sequence validation and deduplication in JetStream

  proposal
  nats-io/nats-server#8819 · Filter by author yueliangwen opened on Nov 1, 2026
  4

• Queue group drops a message when a new member subscribes and the old member unsubscribes moments later

  nats-io/nats-server#8816 · Filter by author pacepace opened on Oct 30, 2026

• Send async INFO to connected clients when account JWT limits change (e.g. max_payload)

  defect
  nats-io/nats-server#8814 · Filter by author choufraise opened on Oct 30, 2026
  1

• Group commit for sync_interval: always on single-server streams

  proposal
  nats-io/nats-server#8810 · Filter by author prithsk opened on Oct 29, 2026
  2

• Durable consumer delete + concurrent recreate (same name) corrupts state or loses messages -- unsynchronized store paths

  nats-io/nats-server#8793 · Filter by author tritsystem opened on Oct 22, 2026
  1

• MQTT: retained PUBLISH stops the readLoop for each JetStream store; clients disconnect on keepalive

  nats-io/nats-server#8790 · Filter by author dev10231235 opened on Oct 21, 2026

• R1 pull consumer stuck after server stall: message redelivered every AckWait, client ACKs ignored until server restart

  defect
  nats-io/nats-server#8789 · Filter by author SerAlxVeeam opened on Oct 21, 2026
  2

• Leaf node permission check caches subject that aliases read buffer → unbounded Sublist cache growth / OOM

  defect
  nats-io/nats-server#8787 · Filter by author ordeneaux opened on Oct 21, 2026
  4

  

• Operator-mode auth-callout clients disconnect on additive MEMORY resolver reload

  nats-io/nats-server#8781 · Filter by author davidfarah2003 opened on Oct 20, 2026
  2

• EnableJetStream(nil) on test servers shares a fixed $TMPDIR/nats/jetstream store across servers and runs

  nats-io/nats-server#8754 · Filter by author shreyaabaranwal opened on Oct 13, 2026
  3

• R3 interest stream: followers pause quorum (applied 100k behind commit) and catch-up loops on snapshot replay at ~1.4k msg/s on idle hardware after cluster restart (2.14.6)

  nats-io/nats-server#8738 · Filter by author ops-gaurav opened on Oct 8, 2026
  1

• Add S2 compression support for gateway connections

  proposal
  nats-io/nats-server#8719 · Filter by author stackedbyaradhya opened on Oct 5, 2026

• Automated RAFT leader rebalancing

  proposal
  nats-io/nats-server#8716 · Filter by author kryops opened on Oct 5, 2026

• Memory leak after dynamic config reload

  defect
  nats-io/nats-server#8697 · Filter by author alyssaruth opened on Oct 2, 2026
  4

• Termination of a deleted pending message acks all messages below it under AckPolicy All

  defect
  nats-io/nats-server#8648 · Filter by author JustDimus-Veeam opened on Sep 25, 2026
  3

• firstMatching silently skips a record that fails its checksum

  defect
  nats-io/nats-server#8632 · Filter by author nberlee opened on Sep 21, 2026
  7

• Stream sourcing throughput capped at ~20K msg/s by a single goroutine

  proposal
  nats-io/nats-server#8612 · Filter by author kaushalaroraharman opened on Sep 17, 2026
  3

• MQTT topics with whitespace cause client disconnects

  proposal
  nats-io/nats-server#8611 · Filter by author nilseckert opened on Sep 17, 2026
  2

• Jetstream: PATCH operation for adding a source to a stream

  proposal
  nats-io/nats-server#8607 · Filter by author ordeneaux opened on Sep 16, 2026
  6

• Discovery timeout to chanve severity level for route connections messages.

  proposal
  nats-io/nats-server#8596 · Filter by author muchologo opened on Sep 13, 2026

• Cross-account import interest is permanently lost when an account is introduced by config reload in a cluster

  defect
  nats-io/nats-server#8560 · Filter by author gedemagt opened on Sep 3, 2026
  3

• Sustained append-latency degradation on a full DiscardOld stream under concurrent filtered-consumer scans

  nats-io/nats-server#8552 · Filter by author daniel-yu-airspace-intelligence opened on Sep 2, 2026
  1

• Trojan Wacatec.B!ml detected by Windows Defender in nats-server-v2.14.6-windows-amd64.zip

  defectstale
  nats-io/nats-server#8531 · Filter by author JonathonQuinn opened on Aug 28, 2026
  2

• KV: TTL-purged values are revived by filestore rebuild after unclean shutdown on R1 streams

  defectstale
  nats-io/nats-server#8505 · Filter by author kumorid opened on Aug 24, 2026
  1