Detections
Analytics
CVE-2026-33218
high
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33218.json
https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339
https://bugzilla.redhat.com/show_bug.cgi?id=2451450
https://advisories.nats.io/CVE/secnote-2026-10.txt
https://access.redhat.com/security/cve/CVE-2026-33218
https://access.redhat.com/errata/RHSA-2026:23345