CVE-2026-39320 Details
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.
A denial-of-service vulnerability has been identified in Signal K Server versions prior to 2.25.0. The issue arises from the WebSocket subscription handling, where unescaped regular expression metacharacters can be injected into the 'context' parameter. This exploitation forces the server's Node.js event loop into a catastrophic backtracking loop, particularly when processing long string identifiers such as the server's UUID. As a result, the server's CPU usage spikes to 100%, causing it to become unresponsive to further API or socket requests.
Users can upgrade to Signal K Server version 2.25.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 21, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d | [email protected] | Patch |
| https://github.com/SignalK/signalk-server/pull/2568 | [email protected] | Issue TrackingPatch |
| https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 | [email protected] | ProductRelease Notes |
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1333 | Inefficient Regular Expression Complexity | [email protected] |
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| signalk signal k server | < 2.25.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 21, 2026 | CVE Modified | CISA-ADP |
| Apr 21, 2026 | New CVE Received | [email protected] |