PT-2026-56559 · Unknown · Nats Server

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CVE-2026-58209

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Published

2026-07-08

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Updated

2026-07-14

CVSS v3.1

4.3

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Name of the Vulnerable Software and Affected Versions NATS Server versions prior to 2.14.3 NATS Server versions prior to 2.12.12
Description MQTT retained message delivery and QoS1+ durable replay may deliver messages to subscribers even if the original topics match a configured subscribe deny rule. This occurs because the delivery paths fail to consistently recheck the concrete original topic before sending the MQTT PUBLISH message to the subscriber.
Recommendations Update NATS Server to version 2.14.3 or later. Update NATS Server to version 2.12.12 or later.

Exploit

Fix

Incorrect Authorization

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Weakness Enumeration

CWE-863

Related Identifiers

AZL-92256
BIT-NATS-2026-58209
CVE-2026-58209
GHSA-7QMQ-8CC4-HXWG
RHSA-2026:36016
RHSA-2026:36017

Affected Products

Nats Server