CVE-2026-25228 SignalK Server has Path Traversal leading to information disclosure
Authenticated attackers on Windows can read, write, and list arbitrary files via path traversal in the applicationData API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25228?
CVE-2026-25228 is a medium-severity path traversal vulnerability in signalk-server, published on 2 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-25228?
2 open source packages ship an affected version, including signalk-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
signalk-server npm | All versions | 2.20.3 |
signalk-server npm | All versions | 2.20.3 |
Products include Signalk Signal K Server.
How do I fix CVE-2026-25228?
Upgrade signalk-server to 2.20.3 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-25228 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25228 exists.
Other vulnerabilities in signalk-server
- CVE-2026-23515 RCE - Command Injection in Signal K set-system-time plugin
- CVE-2025-66398 Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
- CVE-2026-33950 signalk-server: Privilege Escalation by Admin Role Injection via /enableSecurity
- CVE-2025-68620 Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticated Polling
- CVE-2026-41893 Signal K Server's WebSocket Login Endpoint Lacks Rate Limiting (Credential Brute-Force)
Sources
Also known as GHSA-vrhw-v2hw-jffx.