CVE-2026-39320

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-1333 CWE-1333

Affected Products

Vendor	Product	Versions
signalk	signal_k_server	< 2.25.0

References

Advisories & Patches

https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d https://github.com/SignalK/signalk-server/pull/2568 https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884

Exploits

https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884

Other References

https://github.com/SignalK/signalk-server/releases/tag/v2.25.0

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-39320? +

CVE-2026-39320 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-39320? +

CVE-2026-39320 affects products from signalk, specifically: signal_k_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-39320? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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