GHSA-8m2x-3m6q-6w8j
NATS: Message tracing can be redirected to arbitrary subject
At a glance
- Published
- Updated
- CVE
- CVE-2026-33249
- Aliases
- BIT-nats-2026-33249, GO-2026-4826
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Description
### 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.
Affected packages
| Package | Versions |
|---|---|
| Go · github.com/nats-io/nats-server/v2 | introduced 2.11.0, fixed 2.11.15 |
| Go · github.com/nats-io/nats-server/v2 | introduced 2.12.0-preview.1, fixed 2.12.6 |
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33249 ADVISORY
- https://advisories.nats.io/CVE/secnote-2026-15.txt WEB
- https://github.com/nats-io/nats-server PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |