Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nats-io | nats-server | < 2.11.15, >= 2.12.0-RC.1, < 2.12.6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nats-server | 2.12.6-1 | — |
| Debian 13 | nats-server | No fix yet | — |
| Debian 12 | nats-server | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nats-server | No fix yet | — |
| Ubuntu 25.10 | nats-server | No fix yet | — |
| Ubuntu 24.04 LTS | nats-server | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | nats-server | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260326T203309-150000.1.155.2 | SUSE-SU-2026:1135-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nats-server | 2.12.6-r0 | — |
| Alpine v3.23 | nats-server | 2.12.6-r0 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | k3s +1 | 1.35.2.1-r4 | — |
| Wolfi rolling | k3s-1.32 +1 | 1.32.13.1-r7 | — |
| Wolfi rolling | kine | 0.14.15-r1 | — |
| Wolfi rolling | nats | 0.3.2-r0 | — |
| Wolfi rolling | nats-top | 0.6.3-r18 | — |
| Wolfi rolling | telegraf-1.38 | 1.38.1-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/nats-io/nats-server | all versions | — | GHSA-jxxm-27vp-c3m5 |
| Go | github.com/nats-io/nats-server/v2 | < 2.11.15 | 2.11.15 | GHSA-jxxm-27vp-c3m5 |
| Go | github.com/nats-io/nats-server/v2 | >= 2.12.0-RC.1, < 2.12.6 | 2.12.6 | GHSA-jxxm-27vp-c3m5 |
| Go | github.com/nats-io/nats-server/v2 | < 2.11.15 · >= 2.12.0-RC.1, < 2.12.6 | 2.11.15, 2.12.6 | GO-2026-4834 |
Advisories 3
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- WID-SEC-2026-0858 NATS Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 1, 2026
- SUSE-SU-2026:1135-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 31, 2026