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Vulnerability record · CVE-2026-58251 · published 8 July 2026

CVE-2026-58251: Linuxfoundation nats-server improper authorization vulnerability

Linuxfoundation · Nats Server

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

6.5 CVSS 3.1 Medium EPSS 0.46% · top 62.3% CWE-285 · Improper authorization
6.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
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 2.14.0, 2.12.7, and 2.11.16, an authenticated user with subscription deny permissions could bypass a plain subject deny rule by using a queue subscription, because queue-specific deny evaluation could override the plain subject deny result when the queue name itself was not denied. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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/013586288078def45a6788096924eb4d150db65c Patch
https://github.com/nats-io/nats-server/commit/79c2f6e9ff87f594596337b6427dda85c38d1fe1 Patch
https://github.com/nats-io/nats-server/commit/b9ffb63b85e7db3d25a13b2e234f5f7f7c13164d Patch
https://github.com/nats-io/nats-server/releases/tag/v2.11.16 Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.12.7 Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.14.0 Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-jx8g-9g95-6322 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-2026-58251), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.