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CVE-2026-73974— linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE)

Quick assessment

Affected
Linuxfabrik monitoring-plugins
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linuxfabrik Python Libraries是Linuxfabrik组织开源的一系列Python开发库。 Linuxfabrik Python Libraries 6.1.0之前版本存在安全漏洞，该漏洞源于lib.lftest.test()将--test CSV参数的第一或第二个元素作为文件系统路径，并返回文件内容为模拟标准输出或标准错误且无路径限制，可能导致攻击者泄露root可读文件内容。

CVSS 5.5 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 2

VendorProduct Version RangeStatus
Linuxfabrik lib < 6.0.1 affected
Linuxfabrik monitoring-plugins < 7.0.0 affected
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I. Basic Information for CVE-2026-73974

Vulnerability Information
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Vulnerability Title
linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Linuxfabrik Python Libraries 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linuxfabrik Python Libraries是Linuxfabrik组织开源的一系列Python开发库。 Linuxfabrik Python Libraries 6.1.0之前版本存在安全漏洞，该漏洞源于lib.lftest.test()将--test CSV参数的第一或第二个元素作为文件系统路径，并返回文件内容为模拟标准输出或标准错误且无路径限制，可能导致攻击者泄露root可读文件内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linuxfabrik monitoring-plugins < 7.0.0 -
Linuxfabrik lib < 6.0.1 -

II. Public POCs for CVE-2026-73974

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III. Intelligence Information for CVE-2026-73974

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Patches & Fixes for CVE-2026-73974 (2)

Vendor Advisories for CVE-2026-73974 (1)

Vendor Pages for CVE-2026-73974 (1)

Same Patch Batch · Linuxfabrik · 2026-08-18 · 5 CVEs total

CVE-2026-55426 7.8 HIGH linuxfabrik-lib: Local privilege escalation using embedded command
CVE-2026-52817 7.0 HIGH Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalat
CVE-2026-73973 5.5 MEDIUM Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename i
CVE-2026-53759 2.0 LOW linuxfabrik-lib: Insecure creation of SQLite databases

IV. Related Vulnerabilities

Same product: monitoring-plugins
Same vendor: Linuxfabrik
Same weakness: CWE-22

V. Comments for CVE-2026-73974

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