Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. 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 | >= 2.11.0, < 2.11.15, >= 2.12.0-preview.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 | — |
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 | — | GO-2026-4826 |
| Go | github.com/nats-io/nats-server/v2 | >= 2.11.0, < 2.11.15 | 2.11.15 | GHSA-8m2x-3m6q-6w8j |
| Go | github.com/nats-io/nats-server/v2 | >= 2.12.0-preview.1, < 2.12.6 | 2.12.6 | GHSA-8m2x-3m6q-6w8j |
| Go | github.com/nats-io/nats-server/v2 | >= 2.11.0, < 2.11.15 · >= 2.12.0-preview.1, < 2.12.6 | 2.11.15, 2.12.6 | GO-2026-4826 |
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