CVE-2026-33249NATS: Message tracing can be redirected to arbitrary subject
Updated under an hour ago ()
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It affects nats-io nats-server and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Mar 26, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nats-io nats-server nats_io:nats_server (from the name) | from 2.11.0, < 2.11.15; from 2.12.0-preview.1, < 2.12.6 | CNA record |
linuxfoundation nats-server linuxfoundation:nats-server | from 2.11.0 before 2.11.15; from 2.12.0 before 2.12.6 | NVD |
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8jx-refsource-confirm, vendor-advisory
- https://advisories.nats.io/CVE/secnote-2026-15.txtx-refsource-misc, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.