CVE-2026-41893

7.5 HIGH
Published: May 09, 2026 Modified: May 15, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/SignalK/signalk-server/pull/2568
Source: security-advisories@github.com
Issue Tracking Patch
https://github.com/SignalK/signalk-server/releases/tag/v2.25.0
Source: security-advisories@github.com
Product Release Notes
https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g
Source: security-advisories@github.com
Exploit Mitigation Vendor Advisory
https://github.com/SignalK/signalk-server/security/advisories/GHSA-vmfm-ch9h-5c7g
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Mitigation Vendor Advisory

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
0.3%
24th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

signalk