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.
Affected products
signalk: signal k server
References5
- github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj… ExploitVendor Advisory
- github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj… ExploitVendor Advisory
- github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a… Patch
- github.com/SignalK/signalk-server/pull/2568 Issue TrackingPatch
- github.com/SignalK/signalk-server/releases/tag/v2.25.0 ProductRelease Notes
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 38 · as of 13 November 2026
- CWE
- CWE-400CWE-1333
Could this be exploited in your environment?
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