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Vulnerability record · CVE-2026-58209 · published 8 July 2026

CVE-2026-58209: Linuxfoundation nats-server incorrect authorization vulnerability

Linuxfoundation · Nats Server

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.

4.3 CVSS 3.1 Medium EPSS 0.34% · top 74.8% CWE-863 · Incorrect authorization
4.3CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
13 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356 Patch
https://github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87 Patch
https://github.com/nats-io/nats-server/releases/tag/v2.12.12 Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.14.3 Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-58209), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.