CVE-2026-58213

HIGH

NATS Server MQTT Bridge - NATS Protocol Injection

Title source: manual
STIX 2.1

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

References (8)

Core 8
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/nats-io/nats-server/pull/8163
X_Refsource_Misc x_refsource_misc
https://github.com/nats-io/nats-server/pull/8164

Scores

CVSS v3 7.1
EPSS 0.0044
EPSS Percentile 35.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-74
Status published
Products (3)
linuxfoundation/nats-server < 2.12.9
nats-io/nats-server < 2.12.9
nats-io/nats-server >= 2.14.0-RC.1, < 2.14.1
Published Jul 08, 2026
Tracked Since Jul 09, 2026