- Regression in clustered deployments may lose stream consumers; mitigated by setting `meta compact sync: true` and will be fixed in v2.12.6.
- Security updates address CVE‑2026‑29785 (leafnode compression) and CVE‑2026‑27889 (WebSockets).
- Extensive JetStream improvements: snapshot window size, async metalayer snapshots, stream/consumer limit updates, faster wildcard filtering, and numerous bug and race‑condition fixes.
Release v2.12.5
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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;