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CVE-2026-41893

7.5 · HIGH

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

Published May 9, 2026CWE-307EPSS 0.51%

Overview

CVE-2026-41893 is a high-severity vulnerability. It was published on May 9, 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. Prior to version 2.25.0, the HTTP login endpoints (POST /login and POST /signalk/v1/auth/login) are protected by express-rate-limit (default: 100 attempts per 10-minute window, configurable via HTTP_RATE_LIMITS). The WebSocket login path — sending {login: {username, password}} messages over an established WebSocket connection — calls app.securityStrategy.login() directly without any rate limiting. An attacker can bypass HTTP rate limiting entirely by opening a WebSocket connection and attempting unlimited password guesses at the speed bcrypt allows (~20 attempts/sec with 10 salt rounds). This issue has been patched in version 2.25.0.

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-vmfm-ch9h-5c7gGitHubgithub.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g

How CyberStrike helps

Frequently asked questions

What is CVE-2026-41893?

CVE-2026-41893 is a high-severity vulnerability. It was published on May 9, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-41893?

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-2026-41893?

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-2026-41893?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-41893 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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