SignalK signalk-server up to 2.24.x Regular Expression context resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in SignalK signalk-server up to 2.24.x. This vulnerability affects unknown code of the component Regular Expression Handler. Performing a manipulation of the argument context results in resource consumption. This vulnerability was named CVE-2026-39320. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in SignalK signalk-server up to 2.24.x. This affects an unknown code of the component Regular Expression Handler. The manipulation of the argument context with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-39320 since 04/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 2.25.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 215d81eb700d5419c3396a0fbf23f2e246dfac2d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• SignalK

Name

• signalk-server

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24

License

• open-source

Website

• Product: https://github.com/SignalK/signalk-server/

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CPE 2.2info

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