Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Signalk | Signal K Server | < 2.25.0 |
Related Weaknesses (CWE)
References
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2ePatch
- https://github.com/SignalK/signalk-server/pull/2568Issue TrackingPatch
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0ProductRelease Notes
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7ExploitMitigationVendor Advisory
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-41893?
CVE-2026-41893 is a vulnerability with a CVSS score of 7.5 (HIGH). 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-r...
How severe is CVE-2026-41893?
CVE-2026-41893 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-41893?
Check the references section above for vendor advisories and patch information. Affected products include: Signalk Signal K Server.