# NATS v2.14.6-RC.1 — Release v2.14.6-RC.1

- Product: NATS (https://whatsnew.fyi/product/nats)
- Vendor: Synadia
- Date: 2026-08-25
- Version: v2.14.6-RC.1
- Original notes: https://github.com/nats-io/nats-server/releases/tag/v2.14.6-RC.1
- Permalink: https://whatsnew.fyi/product/nats/releases/v2.14.6-rc.1
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **changed** — Removal from service import response maps is now constant-time
- **changed** — The client code no longer resets the deadline more times than necessary when flushing client buffers
- **changed** — The client write buffers are now freed correctly when the working buffer exceeds a rational size
- **changed** — Stream reads are now isolated with a separate lock, which improves the performance of direct gets
- **changed** — Improved the performance of looking up matching sequence numbers for multi-subject gets
- **fixed** — WebSocket client buffers are recycled more aggressively when reallocating into larger buffers
- **fixed** — The filestore block sync no longer incorrectly skips blocks that were compacted during the same pass
- **fixed** — The filestore block sync now performs a single directory sync upon completion rather than once per compacted block
- **fixed** — The filestore I/O semaphore now covers block sync operations
- **fixed** — Stream config updates with replicas greater than 1 are now rejected on non-clustered systems
- **fixed** — Fixed some issues that could prevent stream snapshots from taking place on a clean shutdown
- **fixed** — The filestore inline compaction no longer ignores sync_interval: always
- **fixed** — The stream created time is now preserved after recovery on a standalone server
- **fixed** — Fixed a data race that could apply when accessing the batch ID
- **fixed** — Fixed a data race when reading the consumer direct or sourcing status
- **fixed** — Prevent the consumer direct or sourcing status from being changed with a consumer update
- **fixed** — Fixed an issue where the server could fail to distinguish consumer tiers when enforcing limits
- **fixed** — Fixed a flow control problem where replicated consumers could get stuck after a leader change
- **fixed** — Fixed various consumer create issues that could destroy the state of an existing consumer with the same name
- **fixed** — Internal message delete proposals are no longer counted in the JS API statistics

##### Changelog

Refer to the [2.14 Upgrade Guide](https://docs.nats.io/release-notes/whats_new/whats_new_214) for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped.

###### Go Version

- 1.26.7

###### Improved

General

- Removal from service import response maps is now constant-time (#8463)
- The client code no longer resets the deadline more times than necessary when flushing client buffers (#8513)
- The client write buffers are now freed correctly when the working buffer exceeds a rational size (#8515)

JetStream

- Stream reads are now isolated with a separate lock, which improves the performance of direct gets (#8486)
- Improved the performance of looking up matching sequence numbers for multi-subject gets (#8486) 

###### Fixed

General

- WebSocket client buffers are recycled more aggressively when reallocating into larger buffers (#8518)

JetStream

- The filestore block sync no longer incorrectly skips blocks that were compacted during the same pass (#8456)
- The filestore block sync now performs a single directory sync upon completion rather than once per compacted block (#8461)
- The filestore I/O semaphore now covers block sync operations (#8462)
- Stream config updates with replicas greater than 1 are now rejected on non-clustered systems (#8464)
- Fixed some issues that could prevent stream snapshots from taking place on a clean shutdown (#8465)
- The filestore inline compaction no longer ignores `sync_interval: always` (#8475)
- The stream created time is now preserved after recovery on a standalone server (#8471, contributed by @Green7)
- Fixed a data race that could apply when accessing the batch ID (#8369)
- Fixed a data race when reading the consumer direct or sourcing status (#8478, contributed by @nberlee)
- Prevent the consumer direct or sourcing status from being changed with a consumer update (#8478, contributed by @nberlee)
- Fixed an issue where the server could fail to distinguish consumer tiers when enforcing limits (#8484)
- Fixed a flow control problem where replicated consumers could get stuck after a leader change (#8488)
- Fixed various consumer create issues that could destroy the state of an existing consumer with the same name (#8491)
- Internal message delete proposals are no longer counted in the JS API statistics (#8502)
- Dynamic filestore reservations no longer incorrectly shrink based on used storage after restarts (#8503)

###### Complete Changes
 
https://github.com/nats-io/nats-server/compare/v2.14.5...v2.14.6-RC.1