High · published March 26, 2026
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.
| Product | Versions | Fixed in |
|---|---|---|
| linuxfoundation/nats-server | < 2.11.15 | 2.11.15 |
| linuxfoundation/nats-server | ≥ 2.12.0, < 2.12.6 | 2.12.6 |