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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| nats-io | nats-server | < < 2.11.15; >= 2.12.0-RC.1, < 2.12.6 |
| Red Hat | Multicluster Global Hub 1.4.5 | — |
| Red Hat | Multicluster Global Hub 1.6.5 | — |
| Red Hat | Red Hat multicluster global hub 1.5.3 | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — |
References
- https://advisories.nats.io/CVE/secnote-2026-10.txtMitigation, Vendor Advisory
- https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339Mitigation, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:21769
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/security/cve/CVE-2026-33218
- https://bugzilla.redhat.com/show_bug.cgi?id=2451450
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33218.json
Timeline
- Published
- Mar 25, 2026
- Last modified
- Sep 9, 2026
- NVD status
- Modified