CVE-2026-52817

Summary

Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 5.1.0, the shipped assets/sudoers/Debian.sudoers policy allowed the nagios or icinga account to execute /usr/bin/apt-get as root without restricting its arguments. An attacker who already controls that monitoring account can supply the APT::Update::Pre-Invoke option to execute an arbitrary command while apt-get runs with root privileges, resulting in a root shell and complete compromise of the host. The vulnerable rule supports the check-plugins/deb-updates/deb-updates plugin, but it authorized arbitrary apt-get argument sequences rather than only the required apt-get update –quiet 2 command. This issue is fixed in version 5.1.0.

Affected Software

Weaknesses

• CWE-88: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

References

• https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-8w6w-23mq-h8rg
• https://github.com/Linuxfabrik/monitoring-plugins/commit/694b5daeebadc9a51428f3de1acff7b1f737642f
• https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CHANGELOG.md#v510—2026-05-30
• https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v5.1.0

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