v2.12.15

nats-io/nats-serverv2.12.15Aug 12, 2026by github-actions[bot]

AI Summary

This maintenance release focuses on stability and data integrity, specifically fixing a critical JetStream data loss bug and a logger deadlock. It updates the Go version to 1.25.12.

Key Highlights

Fixed critical JetStream data loss bug in idempotent stream creates
Fixed deadlock in the logger
Updated Go version to 1.25.12

Full Release Notes

## Changelog

### Go Version

- 1.25.12

### Dependencies

- github.com/klauspost/compress v1.19.2 (#8459)
- golang.org/x/crypto v0.55.0 (#8459) 

### Fixed

General

- Fixed a deadlock that could occur in the logger when a close error occurs (#8430)

JetStream

- Fix a bug that could result in potential data loss when handling idempotent stream creates when an offline node catches up from a metalayer snapshot, caused by an incorrect update to the create time in the stream assignment (#8449)

### Complete Changes
 
https://github.com/nats-io/nats-server/compare/v2.12.14...v2.12.15