Detections
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SCA: security update for signalk-server (GHSA-q59x-jc9f-gfqf)

medium Tenable Cloud Security Plugin ID 443508

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Signal K Server is a server application that runs on a central hub in a boat. Prior to 2.28.0,
 makeRemoteRequest() in src/serverroutes.ts accepted attacker-controlled host, port, useTLS, and
 selfsignedcert parameters from the testSignalKConnection, requestAccess, and checkAccessRequest endpoints
 without validating the destination. When security was not configured, addAdminMiddleware() was a no-op in
 dummysecurity.ts, leaving all three endpoints accessible without authentication. The server could be
 forced to contact loopback, private, link-local, cloud metadata, or arbitrary external destinations, and
 selfsignedcert could disable certificate verification for outbound HTTPS requests. The checkAccessRequest
 endpoint also interpolated requestId into its destination path, allowing traversal to other paths on the
 selected host. Distinct success, connection-refused, and timeout responses enabled internal port scanning;
 returned response bodies enabled cloud metadata and internal-service data exfiltration; requestAccess
 enabled server-side POST requests with attacker-controlled JSON; and access to cluster-internal services
 could support lateral movement. This issue is fixed in version 2.28.0. (CVE-2026-55591)

Solution

Update the signalk-server library and its related packages to version 2.28.0 or later.

See Also

https://github.com/advisories/GHSA-q59x-jc9f-gfqf

Plugin Details

Severity: Medium

ID: 443508

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 6/19/2026

Updated: 9/16/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2026-55591

CVSS v3

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/18/2026

Vulnerability Publication Date: 6/18/2026

Reference Information

CVE: CVE-2026-55591

cwe: CWE-918