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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| SignalK | signalk-server | < 2.25.0 |
References
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2dPatch
- https://github.com/SignalK/signalk-server/pull/2568Issue Tracking, Patch
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0Product, Release Notes
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884Exploit, Vendor Advisory
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884Exploit, Vendor Advisory
Timeline
- Published
- Apr 21, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Analyzed