PT-2026-33877 · Signal · Signal K Server

Published 2026-04-21 · Updated 2026-04-21 · CVE-2026-39320

NVD

CVSS v3.1

7.5

High

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

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.

Fix

Resource Exhaustion

DoS

Weakness Enumeration

CWE-400

CWE-1333

Related Identifiers

CVE-2026-39320

Affected Products

Signal K Server

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-39320 · Security Note
• https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 · Note
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 · Note
• https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d · Note
• https://github.com/SignalK/signalk-server/pull/2568 · Note