CVE WatchJul 13, 2026

CVE-2026-58209

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained

CVSS

4.3

Medium

EPSS

0.3%

p27

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 13, 2026 · CWE-863

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-07-092026-07-21

Technical description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.

Official references

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