v2.12.11

umami-software/umamiv2.12.11Jun 9, 2026by github-actions[bot]

AI Summary

This maintenance release updates the Go version to 1.25.11 and fixes a critical regression in JetStream that could cause 'Message Not Found' errors.

Key Highlights

Go version updated to 1.25.11
Fixed JetStream stale subject state tracking regression
Note: v2.14.x versions are not affected

Full Release Notes

## Changelog

Refer to the [2.12 Upgrade Guide](https://docs.nats.io/release-notes/whats_new/whats_new_212) for backwards compatibility notes with 2.11.x.

### Go Version

- 1.25.11

### Fixed

JetStream

- Fixed a regression introduced in v2.12.7 which could result in stale subject state tracking which could manifest in "Message Not Found" errors when a max messages per subject limit is configured (#8285)
  - Please note that v2.14.x versions are not affected

### Complete Changes
 
https://github.com/nats-io/nats-server/compare/v2.12.10...v2.12.11