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

February 2, 2026 (updated February 3, 2026)

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.

References

github.com/SignalK/signalk-server
github.com/SignalK/signalk-server/commit/9bcf61c8fe2cb8a40998b913a02fb64dff9e86c7
github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffx
github.com/advisories/GHSA-vrhw-v2hw-jffx
nvd.nist.gov/vuln/detail/CVE-2026-25228

Code Behaviors & Features

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