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CVE-2026-58214

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 0.35%

Overview

CVE-2026-58214 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, 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.

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/297b166be60fe13144084eed4b25201ead03204aGitHubgithub.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97GitHubgithub.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-4g68-3pwx-5vfj

How CyberStrike helps

Frequently asked questions

What is CVE-2026-58214?

CVE-2026-58214 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-2026-58214?

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-2026-58214?

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-2026-58214?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-58214 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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