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Description

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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-24 | Updated 2026-03-25 | Assigner GitHub_M




MEDIUM: 6.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L

Problem types

CWE-287: Improper Authentication

CWE-488: Exposure of Data Element to Wrong Session

Product status

< 2.11.15
affected

>= 2.12.0-RC.1, < 2.12.6
affected

References

github.com/...server/security/advisories/GHSA-fcjp-h8cc-6879

advisories.nats.io/CVE/secnote-2026-06.tx

cve.org (CVE-2026-33215)

nvd.nist.gov (CVE-2026-33215)

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