# CVE-2026-39320

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-39320
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-400, CWE-1333

## Affected products

- `signalk:signal_k_server`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39320

## Citation

> AI Analytics. CVE-2026-39320. Retrieved 2026-07-18 from https://api.ai-analytics.org/cve/CVE-2026-39320. Derived from NIST NVD. Licensed CC0.

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