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Couchbase Lite Release Notes

3.4.0 — June 2026

Version 3.4.0 for Swift delivers the following features and enhancements:

Enhancements

Fixed Issues

CBL-7250 — Combine change publisher may miss the first result when subscribed on a different dispatch queue
CBL-7960 — Purging a deleted document does not trigger query change listener events
CBL-7985 — MultipeerReplicator may crash when registering a replication task while stopping
CBL-8188 — Potential deadlock when closing a database with active services running
CBL-8236 — Replicator may crash with a SIGABRT when its WebSocket closes during teardown
CBL-8333 — Memory leak when encoding a Codable model into a document
CBL-8355 — MultipeerReplicator may deadlock, causing an iOS watchdog kill (0x8BADF00D) when the app backgrounds
CBL-8363 — Crash due to buffer overrun in Encoder::snip while saving a Version Vector document
CBL-8380 — A peer connection that closes before the TLS handshake completes may hang the MultipeerReplicator
CBL-8395 — Default conflict resolution does not compare revision IDs when two revisions have the same generation
CBL-8475 — Use-after-free crash (EXC_BAD_ACCESS) when a replicator is torn down
CBL-8515 — A stalled inbound P2P TLS handshake can wedge the MultipeerReplicator

Known Issues

CBL-8575 — MultipeerReplicator peer-info methods may block when using Bluetooth

Deprecations

None for this release.

For an overview of the latest features offered in Couchbase Lite 3.4, see New in 3.4.