CVE-2026-39320

HIGH 7.5

Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400 CWE-1333
Vendor	signalk
Product	signalk-server
Published	Apr 21, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

SignalK / signalk-server

< 2.25.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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