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CVE-2026-55182— LibreNMS: Remote Code Execution by Signal Alert Transportation Module

Quick assessment

Affected
librenms librenms
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.

LibreNMS是LibreNMS社区开源的一款网络监控系统。 LibreNMS 21.6.0版本至26.5.0之前版本存在命令注入漏洞，该漏洞源于Signal alert transport中signal-cli路径和Recipient字段未充分转义便传入exec调用，可能导致认证管理员构造包含shell元字符的Recipient及指向composer_wrapper.php脚本的路径，从而执行任意操作系统命令。

CVSS 8.6 · High EPSS 1.61% · P75

Affected Version Matrix 1

VendorProduct Version RangeStatus
librenms librenms >= 21.6.0, < 26.5.0 affected
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I. Basic Information for CVE-2026-55182

Vulnerability Information
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Vulnerability Title
LibreNMS: Remote Code Execution by Signal Alert Transportation Module
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
LibreNMS 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreNMS是LibreNMS社区开源的一款网络监控系统。 LibreNMS 21.6.0版本至26.5.0之前版本存在命令注入漏洞，该漏洞源于Signal alert transport中signal-cli路径和Recipient字段未充分转义便传入exec调用，可能导致认证管理员构造包含shell元字符的Recipient及指向composer_wrapper.php脚本的路径，从而执行任意操作系统命令。
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
librenms librenms >= 21.6.0, < 26.5.0 -

II. Public POCs for CVE-2026-55182

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III. Intelligence Information for CVE-2026-55182

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Patches & Fixes for CVE-2026-55182 (1)

Vendor Advisories for CVE-2026-55182 (1)

Vendor Pages for CVE-2026-55182 (1)

Same Patch Batch · librenms · 2026-08-26 · 3 CVEs total

CVE-2026-80214 8.6 HIGH LibreNMS Virtualisation Discovery Module RCE
CVE-2026-45694 5.4 MEDIUM LibreNMS: Reflected XSS in the Proxmox app view via unsanitized instance/vmid parameters

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-77

V. Comments for CVE-2026-55182

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