CVE-2026-39320
📛 CVE Title
Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths
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.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- GitHub_M
- CVSS severity
- HIGH
- CVSS score
- 7.5 / 10
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Effective score
- 7.5 / 10 HIGH source: CNA overview
- CWE(s)
-
CWE-400,CWE-1333 - Reserved
- 2026-04-06
- Published
- 2026-04-21 02:07 UTC
- Last updated
- 2026-04-21 21:36 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/39xxx/CVE-2026-39320.json
- Linked Threat
- CVE-2026-39320 — Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via WebSocket Subscription Paths
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-04-21 01:16:05 UTC
- NVD last modified
- 2026-04-24 20:51:54 UTC
- NVD CVSS v3.1
- 7.5 / 10 HIGH source: security-advisories@github.com
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0006 (probability of exploitation in next 30 days)
- EPSS percentile
- 17.22% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 12:06 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-24021 - Assigner
- GitHub_M
- Published
- Apr 21, 2026, 12:07:10 AM
- Updated
- Apr 21, 2026, 7:36:54 PM
- EUVD base score (CVSS 3.1)
-
7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EUVD-reported EPSS
- 0.0600
- Vendors
- SignalK
- Products
-
signalk-server (< 2.25.0)
ENISA 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.
EUVD references (4)
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| SignalK | signalk-server |
< 2.25.0 (affected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*
Vendor references (4)
References embedded in the original CVE record by the assigning CNA.
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 x_refsource_CONFIRM
- https://github.com/SignalK/signalk-server/pull/2568 x_refsource_MISC
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d x_refsource_MISC
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 x_refsource_MISC
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
NVD-tagged references (5)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/SignalK/signalk-server/commit/215d81eb700d5419c3396a0fbf23f2e246dfac2d security-advisories@github.com Patch
- https://github.com/SignalK/signalk-server/pull/2568 security-advisories@github.com Issue TrackingPatch
- https://github.com/SignalK/signalk-server/releases/tag/v2.25.0 security-advisories@github.com ProductRelease Notes
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 security-advisories@github.com ExploitVendor Advisory
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-7gcj-phff-2884 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitVendor Advisory
Indicators (1)
IOCs linked to the auto-promoted Threat row.
| Type | Value | VirusTotal | Attached |
|---|---|---|---|
| domain |
node.js
|
no local data | 2026-05-18 21:18 UTC |
Remediations (20)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:hazards.fema.gov
Access the FEMA Mitigation Planning Portal to manage and update your mitigation plans securely.
2026-05-22 17:00 UTC -
web:msrc.microsoft.com
Security Update Guide - Microsoft Security Response Center
2026-05-22 17:00 UTC -
web:onlyfans.com
OnlyFans is the social platform revolutionizing creator and fan connections. The site is inclusive of artists and content creators from all genres and allows them to monetize their content while developing authentic relationships with their fanbase.
2026-05-22 17:00 UTC -
web:www.escapefromtarkov.com
Escape from Tarkov official page
2026-05-22 17:00 UTC -
web:hi.service-now.com
The Now Support portal is your launchpad to access self-help, get technical support, and manage your ServiceNow instances. Log in to manage upgrades, follow changes, view knowledge content, and more. Formerly HI portal.
2026-05-22 17:00 UTC -
web:proprivacy.com
Are you concerned about the growing complex issues surrounding Pornhub? We provide a comprehensive overview of its current state and potential future.
2026-05-22 17:00 UTC -
web:www.truckpartsandservice.com
PGI Northstar LLC reaches a deal to buy intellectual property for FRAM and Trico, among others, for $25 million following First Brands' operational collapse. Read more on TPS.
2026-05-22 17:00 UTC -
web:www.virustotal.com
VirusTotal is a platform for scanning files and URLs for viruses, malware, and other threats using multiple antivirus engines.
2026-05-22 17:00 UTC -
web:www.youtube.com
On ESPN FC, Steve Nicol, Shaka Hislop, Sid Lowe, Gab Marcotti and Stewart Robson join Kay Murray to discuss José Mourinho agreeing to rejoin Real Madrid on a...
2026-05-22 17:00 UTC -
web:www.allrecipes.com
No matter which brand you buy, even the best frozen pizzas can fall flat if they aren't cooked properly. As much as we adore the convenience of a frozen pizza, a pie with a soggy crust or uncooked cheese is a major disappointment. So we asked chefs to share their pro tips about how to cook frozen pizza to crispy, cheesy perfection.
2026-05-22 17:00 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-22 03:17 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-05-22 03:17 UTC -
web:krebsonsecurity.com
For a clickable, per- patch breakdown, check out the SANS Internet Storm Center Patch Tuesday roundup. Running into problems applying any of these updates?
2026-05-22 03:17 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-22 03:17 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
2026-05-22 03:17 UTC -
web:www.cisecurity.org
<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...
2026-05-22 03:17 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-22 03:17 UTC -
web:www.linkedin.com
Oracle has released its January 2026 Critical Patch Update (CPU), a wide-ranging security bulletin that addresses 337 newly identified vulnerabilities across a broad spectrum of its enterprise ...
2026-05-22 03:17 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-22 03:17 UTC -
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-22 03:17 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-39320.json.
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