CVE-2026-33216

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://advisories.nats.io/CVE/secnote-2026-05.txt	Mitigation Vendor Advisory
https://github.com/nats-io/nats-server/commit/b5b63cfc35a57075e09c1f57503d31721bed8099	Patch
https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc	Mitigation Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:21769
https://access.redhat.com/errata/RHSA-2026:22347
https://access.redhat.com/errata/RHSA-2026:23345
https://access.redhat.com/security/cve/CVE-2026-33216
https://bugzilla.redhat.com/show_bug.cgi?id=2451448
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33216.json

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:linuxfoundation:nats-server::::::::
	cpe:2.3:a:linuxfoundation:nats-server::::::::

History

No history.

Information

Published : 2026-03-25 20:16

Updated : 2026-09-09 13:19

NVD link : CVE-2026-33216

Mitre link : CVE-2026-33216

CVE.ORG link : CVE-2026-33216

JSON object : View

Products Affected

linuxfoundation

nats-server

CWE

CWE-256

Plaintext Storage of a Password

CWE-213

Exposure of Sensitive Information Due to Incompatible Policies

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Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users."}, {"lang": "es", "value": "NATS-Server es un servidor de alto rendimiento para NATS.io, un sistema de mensajer\u00eda nativo de la nube y del borde. Antes de las versiones 2.11.15 y 2.12.6, para implementaciones de MQTT que utilizan c\u00f3digos de usuario/contrase\u00f1as: las contrase\u00f1as de MQTT se clasifican incorrectamente como una declaraci\u00f3n de identidad no autenticadora (JWT) y se exponen a trav\u00e9s de los puntos finales de monitoreo. Las versiones 2.11.14 y 2.12.6 contienen una correcci\u00f3n. Como soluci\u00f3n alternativa, aseg\u00farese de que los puntos finales de monitoreo est\u00e9n adecuadamente protegidos. La mejor pr\u00e1ctica sigue siendo no exponer el punto final de monitoreo a Internet u otros usuarios de red no confiables."}], "lastModified": "2026-09-09T13:19:22.887", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "13EA156E-2759-4586-A22E-CDEAAD4D610C", "versionEndExcluding": "2.11.15"}, {"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4E347CFB-C56D-4FD8-8DD8-3D34C08D7154", "versionEndExcluding": "2.12.6", "versionStartIncluding": "2.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}