Vulnerabilities CVE-2026-33218

CVE-2026-33218

High

Open

TLP:CLEAR

NATS has pre-auth server panic via leafnode handling

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.62%

46.4th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Mar 25, 2026
Last Modified: Aug 14, 2026

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