CVE-2026-58210

HighCVSS 7.5/10Last modified Oct 25, 2026

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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
nats-io	nats-server	< 2.12.12; >= 2.14.0-RC.1, < 2.14.3

References

Timeline

Published: Jul 8, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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