~ / search / GHSA-8m2x-3m6q-6w8j

GHSA-8m2x-3m6q-6w8j

NATS: Message tracing can be redirected to arbitrary subject

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-33249

Packages

EcosystemPackageAffectedFixed in
Go github.com/nats-io/nats-server/v2 >= 2.11.0, < 2.11.15 2.11.15
Go github.com/nats-io/nats-server/v2 >= 2.12.0-preview.1, < 2.12.6 2.12.6

Details

As written in the advisory (Markdown source, shown as plain text).

### Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The nats-server supports telemetry on messages, using the per-message NATS headers. ### Problem Description 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. ### Affected Versions Any version before v2.12.6 or v2.11.15 ### Workarounds None.

References

External links from the advisory. They lead to third-party sites.