NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-58213US | — | — | ||
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 characte… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8FIX
- https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736FIX
- https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9FIX
- https://github.com/nats-io/nats-server/pull/8163FIX
- https://github.com/nats-io/nats-server/pull/8164FIX
- https://github.com/nats-io/nats-server/releases/tag/v2.12.9ARTICLE
- https://github.com/nats-io/nats-server/releases/tag/v2.14.1ARTICLE
- https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4fADVISORY
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