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CVE-2026-39320

7.5 · HIGH

Signal K Server is a server application that runs on a central hub in a boat.

Published Apr 21, 2026CWE-400EPSS 0.66%

Overview

CVE-2026-39320 is a high-severity vulnerability. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.25.0 are vulnerable to an unauthenticated Regular Expression Denial of Service (ReDoS) attack within the WebSocket subscription handling logic. By injecting unescaped regex metacharacters into the `context` parameter of a stream subscription, an attacker can force the server's Node.js event loop into a catastrophic backtracking loop when evaluating long string identifiers (like the server's self UUID). This results in a total Denial of Service (DoS) where the server CPU spikes to 100% and becomes completely unresponsive to further API or socket requests. Version 2.25.0 contains a fix.

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/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2dGitHubgithub.com/SignalK/signalk-server/pull/2568GitHubgithub.com/SignalK/signalk-server/releases/tag/v2.25.0GitHubgithub.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884GitHubgithub.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884

How CyberStrike helps

Frequently asked questions

What is CVE-2026-39320?

CVE-2026-39320 is a high-severity vulnerability. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-39320?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-39320?

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-2026-39320?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-39320 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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