Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.10 Added General Account subject mappings, imports, exports and leafnode remote permissions now support the {{account-hash()}}, {{account-hash-import()}} and {{account-hash-leaf-remote()}} subject mapping functions (#8670) TLS configuration now s…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. Go Version 1.27.3 Added General Account subject mappings, imports, exports and leafnode remote permissions now support the {{account-hash()}}, {{account-hash-import()}} and {{account-hash-leaf-remote()}} subject mapping functions (#8670) TLS configuration now supports verify: optional, and the command line sup…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. Go Version 1.27.3, which contains mitigations for CVE-2026-111943 by distrusting eMudhra intermediate certificates (#8798) Dependencies github.com/klauspost/compress v1.20.3 (#8798) golang.org/x/crypto v0.58.0 (#8798) golang.org/x/sys v0.49.0 (#8798) Fixed General Allowed connection types are now correctly res…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.10, which contains mitigations for CVE-2026-111943 by distrusting eMudhra intermediate certificates (#8798) Dependencies github.com/klauspost/compress v1.20.3 (#8798) golang.org/x/crypto v0.58.0 (#8798) golang.org/x/sys v0.49.0 (#8798) Fixed Gene…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. Go Version 1.27.2 (#8740) Dependencies github.com/klauspost/compress v1.20.1 (#8737) github.com/nats-io/nats.go v1.53.1 (#8737) Changed JetStream The max_ha_assets limit is now enforced consistently by the metalayer leader during stream and consumer placement, scaling and moves (#8639) Gateways Support for sen…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.9 (#8740) Dependencies github.com/klauspost/compress v1.20.1 (#8737) github.com/nats-io/nats.go v1.53.1 (#8737) Changed Gateways Support for sending and handling the legacy $GR. reply prefix, used by servers prior to v2.1.2, has been removed (#86…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. Go Version 1.27.1 Improved JetStream Fast batch publish now reports backward sequence gaps as well as forward gaps (#8699) Stream pending message calculations avoid unnecessary filestore cache access and handle deleted sequence ranges more efficiently (#8680, #8681) Stream restore format detection now stops af…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.8 Improved JetStream Fast batch publish now reports backward sequence gaps as well as forward gaps (#8699) Stream pending message calculations avoid unnecessary filestore cache access and handle deleted sequence ranges more efficiently (#8680, #8…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. Go Version 1.27.1 Changed JetStream The max_ha_assets limit is now enforced consistently by the metalayer leader during stream and consumer placement, scaling and moves (#8639) Gateways Support for sending and handling the legacy $GR. reply prefix, used by servers prior to v2.1.2, has been removed (#8615) Impr…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.8 Changed Gateways Support for sending and handling the legacy $GR. reply prefix, used by servers prior to v2.1.2, has been removed (#8615) Improved JetStream Stalled source and mirror flow control is now reported in stream info and warning logs,…
Changelog Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x. This release also contains all changes up to and including v2.14.7. Go Version 1.27.1 (#8551) Added JetStream Desired state metalayer (#8432, #8437, #8439, #8443, #8452, #8460, #8476, #8576, #8598, #8602, #8603) A new desired state reconciliation engine for streams and consumers considerably improves the safet…
Changelog This release also contains all changes up to and including v2.14.7. Go Version 1.27.1 (#8551) Added JetStream Desired state metalayer (#8432, #8437, #8439, #8443, #8452, #8460, #8476, #8576, #8598, #8602) A new desired state reconciliation engine for streams and consumers considerably improves the safety and reliability of asset moves and scales Updating the placement or replication fact…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.8 (#8551) Dependencies github.com/antithesishq/antithesis-sdk-go v0.8.0-default-no-op (#8562) github.com/klauspost/compress v1.20.0 (#8562) golang.org/x/crypto v0.57.0 (#8597) golang.org/x/sys v0.48.0 (#8597) golang.org/x/time v0.16.0 (#8597) Add…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.8 Dependencies golang.org/x/crypto v0.57.0 (#8597) golang.org/x/sys v0.48.0 (#8597) golang.org/x/time v0.16.0 (#8597) Fixed JetStream Fixed a data race between deduplication tracking and stream config updates (#8598) Fixed a potential nil consume…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.8 (#8551) Dependencies github.com/antithesishq/antithesis-sdk-go v0.8.0-default-no-op (#8562) github.com/klauspost/compress v1.20.0 (#8562) golang.org/x/crypto v0.56.0 (#8562) Added JetStream Compatibility for the new desired state metalayer, int…
Changelog This release also contains all changes up to and including v2.14.6. Go Version 1.27.1 (#8551) Added JetStream Desired state metalayer (#8432, #8437, #8439, #8443, #8452, #8460, #8476, #8576) A new desired state reconciliation engine for streams and consumers considerably improves the safety and reliability of asset moves and scales Updating the placement or replication factor midway thro…
Changelog Refer to the 2.14 Upgrade Guide 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 correctl…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.7 Improved JetStream Reduced the number of heap escapes in subject tree matching (#8526) Fixed JetStream Fixed a signalling issue that could stall Raft catchups (#8501) The pending append entry cache in-memory is now bounded by size as well as en…
Changelog Refer to the 2.14 Upgrade Guide 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 correctl…
Changelog ImportantThis is a preview release for the upcoming 2.15 series. This is not a formal release candidate and is still undergoing testing, but we would welcome feedback. This release also contains all changes up to and including v2.14.5. Go Version 1.27.0 Added JetStream Desired state metalayer (#8432, #8437, #8439, #8443, #8452, #8460, #8476) A new desired state reconciliation engine for…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.5 Dependencies github.com/klauspost/compress v1.19.2 (#8459) golang.org/x/crypto v0.55.0 (#8459) Added Leafnodes New dial_timeout option can be specified in the leafnode config block or for specific remotes in the configuration, allowing it to be…
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 incorre…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.5 (#8435) Dependencies github.com/klauspost/compress v1.19.0 (#8385) golang.org/x/crypto v0.54.0 (#8385) golang.org/x/sys v0.47.0 (#8385) github.com/antithesishq/antithesis-sdk-go v0.7.2-default-no-op (#8385) Improved JetStream The Raft transport…
Changelog Go Version 1.25.12 (#8435) Dependencies github.com/klauspost/compress v1.19.0 (#8385) golang.org/x/crypto v0.54.0 (#8385) golang.org/x/sys v0.47.0 (#8385) github.com/antithesishq/antithesis-sdk-go v0.7.2-default-no-op (#8385) Improved JetStream The Raft transport layer has been decoupled, improves testing but does not change server behaviour (#8181) The disk concurrency semaphore has bee…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.4 (#8281) Dependencies golang.org/x/crypto v0.53.0 (#8297) golang.org/x/sys v0.46.0 (#8297) github.com/nats-io/jwt/v2 v2.8.2 github.com/nats-io/nkeys v0.4.16 Improved General Per-connection log lines that could be noisy in normal operation have b…
Changelog Go Version 1.25.11 Dependencies golang.org/x/crypto v0.53.0 (#8297) golang.org/x/sys v0.46.0 (#8297) github.com/nats-io/jwt/v2 v2.8.2 github.com/nats-io/nkeys v0.4.16 Improved General Per-connection log lines that could be noisy in normal operation have been demoted to debug level (#8289) Writer options are now applied consistently when using the s2_fast compression mode (#8047) JetStrea…
Changelog Refer to the 2.12 Upgrade Guide 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 v2.12…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.3 Dependencies golang.org/x/crypto v0.52.0 golang.org/x/sys v0.45.0 github.com/nats-io/jwt/v2 v2.8.2 github.com/nats-io/nkeys v0.4.16 Improved General The client ID is now available through the embedded ClientAuthentication API (#8217) Fixed Gene…
Changelog Refer to the 2.12 Upgrade Guide for backwards compatibility notes with 2.11.x. Go Version 1.25.10 Dependencies golang.org/x/crypto v0.52.0 golang.org/x/sys v0.45.0 github.com/nats-io/jwt/v2 v2.8.2 github.com/nats-io/nkeys v0.4.16 Improved General The client ID is now available through the embedded ClientAuthentication API (#8217) Fixed General A race condition when handling subscription…
Changelog Refer to the 2.14 Upgrade Guide for backwards compatibility notes with 2.12.x. Please note that the 2.13.x version was skipped. Go Version 1.26.3 Dependencies golang.org/x/crypto v0.52.0 golang.org/x/sys v0.45.0 Fixed General A race condition when handling subscription interest over routes has been fixed (#8235) Potential protocol-level corruption from rewriting $JS.ACK subjects has been…