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Vulnerability record · CVE-2026-58214 · published 8 July 2026

CVE-2026-58214: 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, 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.

4.3 CVSS 3.1 Medium EPSS 0.35% · top 74.0% CWE-863 · Incorrect authorization
4.3CVSS 3.1 base score
0.35%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, 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.

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/297b166be60fe13144084eed4b25201ead03204a Patch
https://github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97 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-4g68-3pwx-5vfj 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-2026-58214), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.