CVE-2026-73974
linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE)
Description
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.
INFO
Published Date :
Aug. 18, 2026, 10:17 p.m.
Last Modified :
Nov. 9, 2026, 8:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update linuxfabrik-lib to version 6.1.0 or later.
- Update Linuxfabrik Monitoring Plugins to version 7.0.0 or later.
- Restrict access to the --test argument.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-73974.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73974 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-73974
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-73974 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73974 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Nov. 09, 2026
Action Type Old Value New Value Added Translation Title: Linuxfabrik, Description: linuxfabrik-lib proporciona módulos Python para acceso a bases de datos, almacenamiento en caché, ejecución de shell e integraciones de API, y Linuxfabrik Monitoring Plugins utiliza su ayudante de pruebas compartido en todos los plugins de verificación. Antes de linuxfabrik-lib 6.1.0 y Linuxfabrik Monitoring Plugins 7.0.0, lib.lftest.test() trataba el primer o segundo elemento de un argumento CSV --test como una ruta del sistema de archivos y devolvía el contenido del archivo como salida estándar simulada o error estándar sin confinamiento de ruta. El argumento --test oculto pero accesible en producción era aceptado por plugins autorizados por sudo, por lo que un atacante que controlara la cuenta nagios o icinga podría usar check-plugins/deb-updates/deb-updates con su QUERY=1 predeterminado para divulgar cada línea de un archivo legible por root. Aproximadamente otros 22 plugins exponían contenido filtrado o un oráculo de existencia y legibilidad de archivos root a través del mismo ayudante, mientras que check-plugins/network-bonding/network-bonding y check-plugins/openstack-swift-stat/openstack-swift-stat tenían rutas de lectura directas que eludían al ayudante. La corrección de la biblioteca confina las lecturas de fixtures al directorio de pruebas unitarias del plugin invocador y rechaza anclajes inseguros, y la corrección del plugin enruta los dos desvíos a través de ese ayudante. Estos problemas están solucionados en linuxfabrik-lib 6.1.0 y Linuxfabrik Monitoring Plugins 7.0.0. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 19, 2026
Action Type Old Value New Value Added Reference https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-rh9c-rqvg-f7pr Added SSVC {'id': 'CVE-2026-73974', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-19T16:55:07.626828Z'} -
New CVE Received by [email protected]
Aug. 18, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Linuxfabrik', 'product': 'monitoring-plugins', 'versions': [{'status': 'affected', 'version': '< 7.0.0'}]}, {'vendor': 'Linuxfabrik', 'product': 'lib', 'versions': [{'status': 'affected', 'version': '< 6.0.1'}]}] Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-22 Added CWE CWE-269 Added Reference https://github.com/Linuxfabrik/lib/commit/d665042c55fae83a295ebc0023e8b77f6c473a28 Added Reference https://github.com/Linuxfabrik/lib/releases/tag/v6.1.0 Added Reference https://github.com/Linuxfabrik/monitoring-plugins/commit/f6680a9e4b39569f318feefdb2f51e5d18c7dad5 Added Reference https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v7.0.0 Added Reference https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-rh9c-rqvg-f7pr