CVE-2026-58213: 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…

PriorityP343high7.1CVSS 3.1

AVNACLPRLUINSUCHILAN

EPSS

0.44%

37.0th percentile

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.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
linuxfoundation	nats-server	< 2.12.9	2.12.9
linuxfoundation	nats-server	>= 2.14.0 < 2.14.1	2.14.1
nats-io	nats-server	< 2.12.9	2.12.9
nats-io	nats-server	—	—

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

vendor_redhat7.1HIGH

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