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CVE-2026-58209

4.3 · MEDIUM

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

Published Jul 8, 2026CWE-863EPSS 0.34%

Overview

CVE-2026-58209 is a medium-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356GitHubgithub.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87GitHubgithub.com/nats-io/nats-server/releases/tag/v2.12.12GitHubgithub.com/nats-io/nats-server/releases/tag/v2.14.3GitHubgithub.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-58209?

CVE-2026-58209 is a medium-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-58209?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-58209?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-58209?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-58209 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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