CVE-2026-39320
CVE-2026-39320 · Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 7.5 · High · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
signalk-server
- Versions
- < 2.25.0: Affected
No fix published
signalk-server npm
- Affected ranges
- SEMVER: < 2.25.0
Update to 2.25.0
Original sources
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884
- https://github.com/SignalK/signalk-server/pull/2568
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0
- https://nvd.nist.gov/vuln/detail/CVE-2026-39320