Medium severity5.0OSV Advisory· Published Feb 2, 2026· Updated Jun 17, 2026
CVE-2026-25228
CVE-2026-25228
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
signalk-servernpm | < 2.20.3 | 2.20.3 |
Affected products
30.1.1, 0.1.10, 0.1.11, …+ 1 more
- (no CPE)range: 0.1.1, 0.1.10, 0.1.11, …
- cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*range: <2.20.3
Patches
Vulnerability mechanics
References
4- github.com/SignalK/signalk-server/commit/9bcf61c8fe2cb8a40998b913a02fb64dff9e86c7nvdPatchWEB
- github.com/SignalK/signalk-server/security/advisories/GHSA-vrhw-v2hw-jffxnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-vrhw-v2hw-jffxghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25228ghsaADVISORY
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