Moderate severityNVD Advisory· Published Mar 24, 2026· Updated Mar 25, 2026
NATS is vulnerable to MQTT hijacking via Client ID
CVE-2026-33215
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nats-io/nats-server/v2Go | < 2.11.15 | 2.11.15 |
github.com/nats-io/nats-server/v2Go | >= 2.12.0-RC.1, < 2.12.6 | 2.12.6 |
Affected products
1- Range: < 2.11.15
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/advisories/GHSA-fcjp-h8cc-6879ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33215ghsaADVISORY
- advisories.nats.io/CVE/secnote-2026-06.txghsax_refsource_MISCWEB
- github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879ghsax_refsource_CONFIRMWEB
- pkg.go.dev/vuln/GO-2026-4833ghsaWEB
News mentions
0No linked articles in our index yet.