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NATS is vulnerable to MQTT hijacking via Client ID

CVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-33215

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-33215

Published

nats-server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nats-io",
                    "product": "nats-server",
                    "versions": [
                        {
                            "version": "< 2.11.15",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.12.0-RC.1, < 2.12.6",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 15 Nov 22:09 UTC · 274 of 275 readable · 268 fully read · documentation 469/469 current