CVE-2026-58254

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd	Patch
https://github.com/nats-io/nats-server/releases/tag/v2.12.8	Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.14.3	Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h	Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) NATS Server es un servidor de alto rendimiento para NATS.io, el sistema de mensajería nativo de la nube y del borde. Antes de las versiones 2.14.3 y 2.12.8, las comprobaciones de destino de rastreo de mensajes se aplicaban a las conexiones de clientes ordinarias, pero no de forma consistente a los mensajes que llegaban a través de conexiones de leafnode, lo que permitía a un operador de leafnode enviar eventos de rastreo a temas que de otro modo no estarían permitidos y utilizar un comportamiento de solo rastreo para evitar la entrega o el almacenamiento normal de los mensajes afectados. Este problema está solucionado en las versiones 2.14.3 y 2.12.8.

Information

Published : 2026-07-08 20:16

Updated : 2026-10-25 17:10

NVD link : CVE-2026-58254

Mitre link : CVE-2026-58254

CVE.ORG link : CVE-2026-58254

JSON object : View

Products Affected

linuxfoundation

nats-server

CWE

CWE-863

Incorrect Authorization

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