CVE-2026-58254
Fixed in a distro release EPSS <1%CVSS 5.3
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.
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 |