TI-2026-51979 Aliases CVE-2026-73974 GHSA-rh9c-rqvg-f7pr

linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE)

MEDIUM 58CWE-22Published 2026-08-18 · Updated 2026-08-19

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Information disclosure, Privilege escalation
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22, CWE-269 and the CVSS impact.

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 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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00168 6th percentileScored 2026-11-07

Fix Fixed monitoring-plugins (Linuxfabrik): 7.0.0lib (Linuxfabrik): 6.0.1+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linuxfabrik	monitoring-plugins	before 7.0.0	7.0.0	Patch available	CNA
Linuxfabrik	lib	before 6.0.1	6.0.1	Patch available	CNA
—	linuxfabrik-lib (PyPI)	before 6.1.0	6.1.0	Patch available	GHSA-rh9c-rqvg-f7pr

monitoring-plugins VendorLinuxfabrik Affected before 7.0.0 Fixed in 7.0.0 Patch available CNA
lib VendorLinuxfabrik Affected before 6.0.1 Fixed in 6.0.1 Patch available CNA
linuxfabrik-lib (PyPI) Vendor— Affected before 6.1.0 Fixed in 6.1.0 Patch available GHSA-rh9c-rqvg-f7pr

Remediation

Fix · CNA monitoring-plugins (Linuxfabrik) Fixed in 7.0.0
Fix · CNA lib (Linuxfabrik) Fixed in 6.0.1
Fix · GHSA-rh9c-rqvg-f7pr linuxfabrik-lib (PyPI) Fixed in 6.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-73974
2026-10-03 Alias added: GHSA-rh9c-rqvg-f7pr

References

Other 6

TI-2026-39994 linuxfabrik-lib: Local privilege escalation using embedded command CVSS 3.1HIGH 7.8
TI-2026-37926 Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation CVSS 4.0HIGH 7.0
TI-2026-51978 Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers LPE) CVSS 3.1MEDIUM 5.5
TI-2026-38766 linuxfabrik-lib: Insecure creation of SQLite databases CVSS 4.0LOW 2.0
TI-2026-47716 Linuxfabrik monitoring-plugins: SSRF and auth-token disclosure via unvalidated @odata.id link in redfish-* plugins CVSS 4.0HIGH 8.3
TI-2026-47715 linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect CVSS 4.0MEDIUM 6.0

See all 7 →

Sources

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