CVE-2026-58214

published 2026-07-08

CVE-2026-58214: 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, an authenticated MQTT client…

Priority P4 24 medium 4.3 CVSS 3.1

AV N AC L PR L UI N S U C L I N A N

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, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
linuxfoundation	nats-server	< 2.12.12	2.12.12
linuxfoundation	nats-server	>= 2.14.0 < 2.14.3	2.14.3

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