CVE-2026-39320: Signal K Server is a server application that runs on a central hub in a boat

Q: How do I fix CVE-2026-39320?

signal k server: upgrade to 2.25.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39320 being exploited?

CVE-2026-39320 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39320 affect?

CVE-2026-39320 affects signal k server. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2026-39320?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-39320 is a high-severity flaw (CVSS 7.5) affecting signal k server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 l

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-400, CWE-1333
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: signalk

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 01:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

signalk signal k server UPGRADE

Affected: < 2.25.0

Fixed in: 2.25.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy signal-k-server || rpm -q signal-k-server || signal-k-server --version

2. UPGRADE to 2.25.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade signal-k-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade signal-k-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39320?

signal k server: upgrade to 2.25.0. Exact commands for each OS are on this page.

Is CVE-2026-39320 being exploited?

CVE-2026-39320 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39320 affect?

CVE-2026-39320 affects signal k server. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-39320?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

References

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