CVE-2026-58213

HIGH7.1

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

Published Jul 8, 2026

Modified 6 days ago

Details

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.

References

WEB

https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8

WEB

https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736

WEB

https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9

WEB

https://github.com/nats-io/nats-server/pull/8163

WEB

https://github.com/nats-io/nats-server/pull/8164

WEB