CVE-2026-52817: Linuxfabrik Monitoring Plugins privilege escalation in Debian.sudoers

CVE-2026-52817 · Severity: high · CVSS 4 · Published 2026-07-02

A vulnerability in the configuration files of Linuxfabrik Monitoring Plugins allows a user with monitoring privileges to gain full administrative (root) control over the server. The software incorrectly allows the monitoring user to run system update commands with arbitrary options, which can be manipulated to launch a command shell with elevated permissions. This could allow an attacker who has already gained a foothold on the system to take complete control of the infrastructure.

Technologies: Linuxfabrik Monitoring-Plugins, linuxfabrik-lib (PyPI). Vendors: Linuxfabrik, PyPI.

Quick answers

Is CVE-2026-52817 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-52817 being exploited in the wild.
How severe is CVE-2026-52817?
High severity, with a CVSS score of 4, published 2 July 2026.
Which products and versions are affected?
Linuxfabrik Monitoring-Plugins <= 5.0.0; linuxfabrik-lib (PyPI) <= 5.0.0, ECOSYSTEM:introduced=0,fixed=5.1.0.
Is there a fix for CVE-2026-52817?
Yes. linuxfabrik-lib (PyPI): upgrade to 5.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-52817 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-52817?
Check whether you run Linuxfabrik Monitoring-Plugins or linuxfabrik-lib (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • linuxfabrik-lib (PyPI): upgrade to 5.1.0 or later
    pip install "linuxfabrik-lib>=5.1.0"

Technical details

The vulnerability is classified as an argument injection (CWE-88) within the 'Debian.sudoers' file provided by Linuxfabrik Monitoring Plugins. The configuration allows the 'nagios' user to execute '/usr/bin/apt-get' via sudo without restricting the allowed arguments. An attacker with access to the nagios account can exploit this by passing the '-o APT::Update::Pre-Invoke' option to 'apt-get update', triggering the execution of an arbitrary shell as the root user. This local privilege escalation requires high privileges (access to the nagios account) but no user interaction. The issue is addressed in version 5.1.0 by restricting sudoers entries to specific, safe command arguments.

Affected products

  • Linuxfabrik monitoring-plugins <= 5.0.0
  • Linuxfabrik linuxfabrik-lib <= 5.0.0

Identifiers

  • CVE-2026-52817
  • GHSA-8w6w-23mq-h8rg
  • PYSEC-2026-2595

Timeline

  • 2026-05-29: disclosed
  • 2026-07-02: advisory: GitHub Advisory published
  • 2026-07-02: patched

References

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