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Vulnerability record · CVE-2026-58213 · published 8 July 2026

CVE-2026-58213: Linuxfoundation nats-server injection vulnerability

Linuxfoundation · Nats Server

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 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.

7.1 CVSS 3.1 High EPSS 0.44% · top 64.2% CWE-74 · Injection
7.1CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
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 2.14.1 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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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/366837cfc65ab9ccb4f98193c65e8daf238582d8 Patch
https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736 Patch
https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9 Patch
https://github.com/nats-io/nats-server/pull/8163 Issue TrackingPatch
https://github.com/nats-io/nats-server/pull/8164 Issue TrackingPatch
https://github.com/nats-io/nats-server/releases/tag/v2.12.9 Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.14.1 Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f 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-2026-58213), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.