CVE-2026-39320

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d	Patch
https://github.com/SignalK/signalk-server/pull/2568	Issue Tracking Patch
https://github.com/SignalK/signalk-server/releases/tag/v2.25.0	Product Release Notes
https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884	Exploit Vendor Advisory
https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-21 01:16

Updated : 2026-06-17 10:41

NVD link : CVE-2026-39320

Mitre link : CVE-2026-39320

CVE.ORG link : CVE-2026-39320

JSON object : View

Products Affected

signalk

signal_k_server

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-1333

Inefficient Regular Expression Complexity

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