Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Signalk | Signal K Server | < 2.25.0 |
Related Weaknesses (CWE)
References
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2ePatch
- https://github.com/SignalK/signalk-server/pull/2568Issue TrackingPatch
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0ProductRelease Notes
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-288ExploitVendor Advisory
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-288ExploitVendor Advisory
FAQ
What is CVE-2026-39320?
CVE-2026-39320 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 t...
How severe is CVE-2026-39320?
CVE-2026-39320 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39320?
Check the references section above for vendor advisories and patch information. Affected products include: Signalk Signal K Server.