- Minimum supported Erlang version upgraded to 27.0; nodes on older Erlang will refuse to start.
- Comprehensive bug‑fixes and stability improvements across core server, CLI tools, and many plugins (queues, streams, management UI, OAuth, shovel, federation, MQTT, STOMP, LDAP, AWS) with reduced log noise and race‑condition fixes.
- Security hardening: password salts now generated with a CSPRNG, OAuth token handling and expiry improvements, and stricter validation for stream and federation URIs.
RabbitMQ 4.2.9
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Core fixes: quorum‑queue metrics/snapshot after upgrades, stricter and faster AMQP 1.0 parsing.
Minimum supported Erlang version upgraded to 27.0; Erlang/OTP 26 is now unsupported, causing nodes on older Erlang to fail to start (breaking change).
Core server fixes: tie‑binding bug, correct storage of password‑less users, consumer activity updates, argument validation, default queue type handling, and smarter feature‑flag sync; plus enhancements like per‑node channel limits, paral...