4.3Medium
CVE-2026-33249NATS: Message tracing can be redirected to arbitrary subject
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.
Weakness (CWE):
CWE-863
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| linuxfoundation | nats-server | 2.11.0 – < 2.11.15 | |
| nats-io | nats-server | >= 2.11.0, < 2.11.15, >= 2.12.0-preview.1, < 2.12.6 |
References and patches
- https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j Vendor Advisory
- https://advisories.nats.io/CVE/secnote-2026-15.txt Vendor Advisory
CPE matches (NVD) (2)
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*≥ 2.11.0 < 2.11.15cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*≥ 2.12.0 < 2.12.6