CVE-2026-41893

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d	Patch
https://github.com/SignalK/signalk-server/pull/2568	Issue Tracking Patch
https://github.com/SignalK/signalk-server/releases/tag/v2.25.0	Product Release Notes
https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g	Exploit Mitigation Vendor Advisory
https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-09 20:16

Updated : 2026-07-24 19:10

NVD link : CVE-2026-41893

Mitre link : CVE-2026-41893

CVE.ORG link : CVE-2026-41893

JSON object : View

Products Affected

signalk

signal_k_server

CWE

CWE-307

Improper Restriction of Excessive Authentication Attempts

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