CVE-2026-39320

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.

CVSS Vector

References

• https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d
• https://github.com/SignalK/signalk-server/pull/2568
• https://github.com/SignalK/signalk-server/releases/tag/v2.25.0
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884