- Fixes multiple CVEs spanning MQTT, leafnodes, WebSockets, JetStream, TLS, and credential handling, improving overall security.
- Introduces a 1 MB JWT size limit and enables HTTP CONNECT proxying for non‑WebSocket leafnode connections, plus enhanced MQTT protocol compliance.
- Resolves numerous bugs and stability issues across JWT redaction, expvar endpoint, Windows service shutdown, PROXY protocol parsing, JetStream stream/consumer operations, Raft voting, and WebSocket parsing.
Release v2.12.6
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Added Leafnodes support with a configurable dial timeout option for high‑latency links
Upgrade to Go 1.25.12 and bump critical dependencies (klauspost/compress v1.19.2, golang.org/x/crypto v0.55.0).
Decoupled Raft transport and increased disk concurrency (now configurable) with several JetStream performance and memory optimizations;