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CVE-2026-73973— Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers 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 监控插件为 Icinga、Nagios 及相关系统提供监控插件。在 7.0.0 版本之前， 接受自由格式的 路径，并通过随附的 Nagios 或 Icinga 的 sudoers 允许列表以 root 权限打开该文件，而未将解析后的路径限制在 目录下。攻击者如果控制了监控账户，可以选择一个 root 可读的文件（如 ），并将 设置为 ，同时保持 为 ，从而将每一行非空内容收集到 中，并通过 返回。漏洞流程将扩展后的 直接传递给 函数，且既没有进行真实路径的边界检查，也没有通过白名单进行保护。

CVSS 5.5 · Medium EPSS 0.21% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
Linuxfabrik monitoring-plugins < 7.0.0 affected
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I. Basic Information for CVE-2026-73973

Vulnerability Information
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Vulnerability Title
Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers LPE)
Source: CVE Program / CVE List V5
Vulnerability Description
Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 7.0.0, check-plugins/logfile/logfile accepted a free-form --filename path and opened it as root when invoked through the shipped nagios or icinga sudoers allowlist, without confining the resolved path to /var/log. An attacker who controls the monitoring account can select a root-readable file such as /etc/shadow and use --warning-regex . while leaving SUPPRESS_OUTPUT false, causing each nonempty line to be collected in warn_matches and returned through lib.base.oao(). The vulnerable flow passes the expanded scan_path directly to open(), and neither real-path containment nor an allowlist protects the sink. The same fix also confines mysql-logfile and openvpn-client-list paths, allows only documented log roots, and resolves symlinks and parent-directory traversal before checking containment. This issue is fixed in version 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

Affected Products

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

II. Public POCs for CVE-2026-73973

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III. Intelligence Information for CVE-2026-73973

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Patches & Fixes for CVE-2026-73973 (1)

Vendor Advisories for CVE-2026-73973 (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-2026-73974 5.5 MEDIUM linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sud
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-2026-73973

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