v2.12.15

BuilderIO/gpt-crawlerv2.12.15Aug 12, 2026by github-actions[bot]

AI Summary

A maintenance release for the 2.12.x branch fixing the same critical deadlock and data loss issues found in the 2.14.x series.

Key Highlights

Go version updated to 1.25.12
Fixed deadlock in logger when a close error occurs
Fixed potential data loss in JetStream idempotent stream creates

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