---
id: CVE-2026-73974
title: >-
  linuxfabrik-lib provides Python modules for database access, caching, shell
  execution, and API integrations, and Linuxfabrik Monitoring Plugins uses its
  shared testing helper across check plugins
summary: >-
  linuxfabrik-lib provides Python modules for database access, caching, shell
  execution, and API integrations, and Linuxfabrik Monitoring Plugins uses its
  shared testing helper across check plugins. Prior to linuxfabrik-lib 6.1.0 and
  Linux…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
  - CWE-269
vendor: linuxfabrik-lib
product: linuxfabrik-lib
affected:
  - linuxfabrik-lib < 6.1.0
patched:
  - linuxfabrik-lib 6.1.0
published: '2026-08-18'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:13:25.910'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73974'
references:
  - url: >-
      https://github.com/Linuxfabrik/lib/commit/d665042c55fae83a295ebc0023e8b77f6c473a28
    label: security-advisories@github.com
  - url: 'https://github.com/Linuxfabrik/lib/releases/tag/v6.1.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/Linuxfabrik/monitoring-plugins/commit/f6680a9e4b39569f318feefdb2f51e5d18c7dad5
    label: security-advisories@github.com
  - url: 'https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v7.0.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-rh9c-rqvg-f7pr
    label: security-advisories@github.com
  - url: >-
      https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-rh9c-rqvg-f7pr
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-rh9c-rqvg-f7pr'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00168
epssPercentile: 0.05434
aliases:
  - GHSA-rh9c-rqvg-f7pr
ecosystem: pip
ingestedAt: '2026-08-18T21:22:59.401Z'
---

## Overview

linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations, and Linuxfabrik Monitoring Plugins uses its shared testing helper across check plugins. Prior to linuxfabrik-lib 6.1.0 and Linuxfabrik Monitoring Plugins 7.0.0, lib.lftest.test() treated the first or second element of a --test CSV argument as a filesystem path and returned the file contents as simulated standard output or standard error without path confinement. The hidden but production-accessible --test argument was accepted by sudo-authorized plugins, so an attacker controlling the nagios or icinga account could use check-plugins/deb-updates/deb-updates with its default QUERY=1 to disclose every line of a root-readable file. Approximately 22 other plugins exposed filtered content or a root file existence and readability oracle through the same helper, while check-plugins/network-bonding/network-bonding and check-plugins/openstack-swift-stat/openstack-swift-stat had direct read paths that bypassed the helper. The library fix confines fixture reads to the invoking plugin's unit-test directory and refuses unsafe anchors, and the plugin fix routes the two bypasses through that helper. These issues are fixed in linuxfabrik-lib 6.1.0 and Linuxfabrik Monitoring Plugins 7.0.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-73974)

Affected packages:

- `linuxfabrik-lib < 6.1.0`

Patched in:

- `linuxfabrik-lib 6.1.0`

Source: https://github.com/advisories/GHSA-rh9c-rqvg-f7pr