Security Advisory

CVE-2026-33218

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-03-25 19:53:12

Last updated 2026-07-27 12:05:46

Assigner GitHub_M

CVSS score 7.5

State PUBLISHED

Description

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.

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