VULNERABILITY INTELLIGENCE

CVE-2026-33218

CVSS score7.5 HIGH
EPSS probability0.63%
CISA KEVNot currently listed
Published2026-03-25
Last modified2026-09-09
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-20
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-1286

Primary references