RCE in Signalk Signal K Server
CVE-2026-23515
Signal K Server is a server application that runs on a central hub in a boat. Prior to 1.5.0, a command injection vulnerability allows authenticated users with write permissions to execute arbitrary shell commands on the Signal K server when the set-system-time plugin is enabled. Unauthenticated users can also exploit this vulnerability if security is disabled on the Signal K server. This occurs due to unsafe construction of shell commands when processing navigation.datetime values received via WebSocket delta messages. This vulnerability is fixed in 1.5.0.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.042 (90.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Signalk Signal_k_server
- Signalk Signalk-server — versions < 1.5.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-23515?
- CVE-2026-23515 is a critical-severity vulnerability in Signalk Signal K Server, classified under OS Command Injection. CVSS score: 9.9/10. Published 2026-02-02.
- How severe is CVE-2026-23515?
- Critical severity. CVSS v3 base score is 9.9 out of 10.