CVE-2026-25228

The record

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 packages

Related vulnerabilities

• GHSA-vrhw-v2hw-jffx SignalK Server has Path Traversal leading to information disclosure Same vulnerability
• GHSA-q59x-jc9f-gfqf Signal K Server: Server-Side Request Forgery via Remote Connection Endpoints Also affects signalk-server
• CVE-2026-41893 Signal K Server is a server application that runs on a central hub in a boat. Also affects signalk-server
• GHSA-vmfm-ch9h-5c7g Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force) Also affects signalk-server
• GHSA-7gcj-phff-2884 Signal K Server has an Unauthenticated Regular Expression Denial of Service (ReDoS) via… Also affects signalk-server
• CVE-2026-39320 Signal K Server is a server application that runs on a central hub in a boat. Also affects signalk-server
• GHSA-cxj8-ggf2-p57c Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow Also affects signalk-server
• GHSA-gfmv-vh34-h2x5 Signal K Server: Unauthenticated Source Priorities Manipulation Also affects signalk-server