CVE-2026-58210
Fixed in a distro release EPSS <1%CVSS 7.5
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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. 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 |