CVE-2026-33215: Linuxfoundation Nats-Server

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.

Affected products

• Linuxfoundation Nats-Server: from 2.0.0, before 2.11.15 (fixed in 2.11.15); from 2.12.0, before 2.12.5 (fixed in 2.12.5)

Published 2026-03-24. Last modified 2026-06-17.