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CVE-2026-33215

NATS is vulnerable to MQTT hijacking via Client ID

Published: Mar 24, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-287
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 85.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-287CWE-488

Affected Products

nats-servernats-io
On-prem
Databases / cache-message-queue
nats-serverlinuxfoundation
Mixed
AI / ML / ml-framework
nats-iooss-projectDatabases
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879
github.com
https://advisories.nats.io/CVE/secnote-2026-06.tx
advisories.nats.io

Timeline

Published
Mar 24, 2026
Last Updated
Mar 26, 2026

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