- Updated baseline to Erlang 25 (nodes won’t start on older releases) with performance gains and TLS 1.3 support
- Operator policies can now define “ha sync mode” for classic mirrored queues, which are deprecated and will be removed in RabbitMQ 4.0; migrate to quorum queues or streams
- Fixed RPM packaging bug that incorrectly limited supported Erlang versions to ≤ 25.3.0
RabbitMQ 3.11.15
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Core server bug fixes: duplicate direct‑reply deliveries, quorum queue recovery issues, malformed AMQP 1.0 frames, topic‑exchange wildcard limits, and OAuth proxy header handling.