CVE-2026-58209
Fixed in a distro release EPSS <1%CVSS 4.3
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.
Products: nats-io nats-server
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | nats-server | no fix |
| Debian 13 | nats-server | no fix |
| Debian 14 | nats-server | 2.14.3-1 |
| Red Hat hummingbird 1 | nats-server2.12 | 0:2.12.12-1.hum1 |
| Red Hat hummingbird 1 | nats-server2.14 | 0:2.14.3-1.hum1 |
| Ubuntu 24.04 LTS | nats-server | no fix |
| Ubuntu 25.10 | nats-server | no fix |
| Ubuntu 26.10 | nats-server | no fix |
| Ubuntu Pro 26.04 LTS | nats-server | no fix |