Linuxfabrik monitoring-plugins up to 6.x logfile open filename path traversal

Summaryinfo

A vulnerability classified as problematic has been found in Linuxfabrik monitoring-plugins up to 6.x. This issue affects the function Open of the file check-plugins/logfile/logfile of the component logfile. Performing a manipulation of the argument filename results in path traversal. This vulnerability is known as CVE-2026-73973. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Linuxfabrik monitoring-plugins up to 6.x. It has been classified as problematic. This affects the function open of the file check-plugins/logfile/logfile of the component logfile. The manipulation of the argument filename with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 7.0.0, check-plugins/logfile/logfile accepted a free-form --filename path and opened it as root when invoked through the shipped nagios or icinga sudoers allowlist, without confining the resolved path to /var/log. An attacker who controls the monitoring account can select a root-readable file such as /etc/shadow and use --warning-regex . while leaving SUPPRESS_OUTPUT false, causing each nonempty line to be collected in warn_matches and returned through lib.base.oao(). The vulnerable flow passes the expanded scan_path directly to open(), and neither real-path containment nor an allowlist protects the sink. The same fix also confines mysql-logfile and openvpn-client-list paths, allows only documented log roots, and resolves symlinks and parent-directory traversal before checking containment. This issue is fixed in version 7.0.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-73973 since 08/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 7.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• Linuxfabrik

Name

• monitoring-plugins

Version

• 6.x

Website

• Product: https://github.com/Linuxfabrik/monitoring-plugins/

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