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CVE-2026-25228: SignalK Server has Path Traversal leading to information disclosure

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-02 · updated 2026-06-17
• Weakness: CWE-22

Description

Signal K Server is a server application that runs on a central hub in a boat. Prior to 2.20.3, a path traversal vulnerability in SignalK Server's applicationData API allows authenticated users on Windows systems to read, write, and list arbitrary files and directories on the filesystem. The validateAppId() function blocks forward slashes (/) but not backslashes (\), which are treated as directory separators by path.join() on Windows. This enables attackers to escape the intended applicationData directory. This vulnerability is fixed in 2.20.3.

Affected products

• signalk-server: before 2.20.3 — fixed in 2.20.3

How to fix

Upgrade to a fixed version: signalk-server 2.20.3. Check the vendor advisory for mitigations.

References

• https://github.com/SignalK/signalk-server/commit/9bcf61c8fe2cb8a40998b913a02fb64dff9e86c7
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffx

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