SignalK signalk-server is a server application designed to run on a central hub in boats, facilitating data exchange and system monitoring. Versions prior to 2.19.0 contain an unauthenticated information disclosure vulnerability (CVE-2025-68273) classified under CWE-200. This flaw allows any unauthenticated user to access sensitive system information, including the complete SignalK data schema, details about connected serial devices, and installed analyzer tools. Such information leakage does not directly compromise system integrity or availability but significantly aids attackers by providing detailed reconnaissance data. The vulnerability is remotely exploitable without any user interaction or authentication, increasing its risk profile. The CVSS 3.1 base score is 5.3, reflecting a medium severity due to the confidentiality impact and ease of exploitation. No known exploits are currently reported in the wild. The vulnerability was publicly disclosed on January 1, 2026, and fixed in version 2.19.0 of the signalk-server software. Organizations running affected versions are advised to upgrade to the patched release to prevent unauthorized data exposure.

For European organizations, particularly those involved in maritime operations such as shipping companies, port authorities, and marine research institutions, this vulnerability poses a significant risk. Exposure of the SignalK data schema and connected device information can facilitate targeted attacks against vessel control systems or navigation aids. Attackers could leverage this reconnaissance to craft more sophisticated attacks, potentially leading to operational disruptions or safety hazards. While the vulnerability does not directly allow system control or data modification, the sensitive information disclosed could be used in multi-stage attacks, increasing the overall threat landscape. Given Europe's extensive maritime industry and reliance on digital systems for vessel management, the impact could affect operational security and safety compliance.

European maritime organizations should immediately verify their signalk-server version and upgrade to version 2.19.0 or later to remediate the vulnerability. Network segmentation should be enforced to restrict access to the signalk-server from untrusted networks, limiting exposure to potential attackers. Implementing strong access controls and monitoring on the central hub devices can detect and prevent unauthorized access attempts. Additionally, organizations should conduct regular audits of connected serial devices and installed tools to identify any anomalies. Employing intrusion detection systems tailored for maritime environments can provide early warnings of reconnaissance activities. Finally, integrating vulnerability management processes to track and apply updates promptly will reduce exposure to similar future vulnerabilities.