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 是一种网络监控系统。在 21.6.0 至 26.5.0 版本中，Signal 告警传输模块存在命令注入漏洞，原因是 signal-cli 的执行路径以及告警传输配置中的“Recipient”（接收者）字段在传递给 调用前未进行充分转义。经过身份验证的管理员可以构造一个传输条目，使其“Recipient”字段包含 shell 元字符，并将路径指向捆绑的 脚本；该脚本本身会将攻击者可控的输入传递给其他不安全的 调用。通过将这些调用串联起来，管理员可以在 LibreNMS 主机上执行任意操作系统命令。该
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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
Affected Products
II. Public POCs 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)
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🔗 Release 26.5.0 · librenms/librenms · GitHub x_refsource_MISC
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
V. Comments for CVE-2026-55182
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