NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection (nats-io nats-server)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.44 % · percentile 38 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.
Weaknesses (CWE)
- CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component
References
- https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f
- https://github.com/nats-io/nats-server/pull/8163
- https://github.com/nats-io/nats-server/pull/8164
- https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8
- https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736
- https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9
- https://github.com/nats-io/nats-server/releases/tag/v2.12.9
- https://github.com/nats-io/nats-server/releases/tag/v2.14.1
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N | GitHub_M |
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N | NVD · security-advisories@github.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-42383
- GCVE · GCVE-0-2026-58213
Affected configurations (NVD CPE)
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*< 2.12.9cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*≥ 2.14.0 < 2.14.1
Affected products
| Product | Versions |
|---|---|
| nats-io · nats-server | affected < 2.12.9 ; affected >= 2.14.0-RC.1, < 2.14.1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |