Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M
CVE-2026-39320Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths
High 7.5
In plain English
A high-severity uncontrolled resource consumption in signalk-server from SignalK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | signalk-server | 2.25.0 | GHSA-7gcj-phff-2884 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| SignalK | signalk-server | < 2.25.0 |
Weakness: CWE-400, CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 x_refsource_CONFIRM
- https://github.com/SignalK/signalk-server/pull/2568 x_refsource_MISC
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d x_refsource_MISC
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 x_refsource_MISC