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CVE-2026-84194— LibreNMS 23.10.0 before 26.4.0 OS Command Injection via Hostname

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 版本 ≥ 23.10.0 且 < 26.2.0（在 26.4.0 中修复）中存在一个经过身份验证的操作系统命令注入漏洞，该漏洞位于 libvirt 发现功能中。当启用 libvirt 支持（即设置 ）时，设备主机名（ ）会被直接拼接进 shell 命令（如 、 / / ），并在 中通过 执行，但既未使用 进行转义，也未对参数进行分离。经过身份验证的管理员可以通过设置一个经过精心构造的设备主机名，从而注入任意操作系统命令，导致在发现工作进程（discovery worker）上下文中实现远程代码执行

CVSS 8.6 · High
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I. Basic Information for CVE-2026-84194

Vulnerability Information
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Vulnerability Title
LibreNMS 23.10.0 before 26.4.0 OS Command Injection via Hostname
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS versions >= 23.10.0 and < 26.2.0 (fixed in 26.4.0) contain an authenticated OS command injection vulnerability in libvirt discovery. When libvirt support is enabled (enable_libvirt=true), the device hostname ($this->getDevice()->hostname) is concatenated into shell commands (ssh, virsh list/dumpxml/domstate) in VminfoLibvirt.php and passed to exec() without escapeshellarg() or argument separation. An authenticated admin can set a crafted device hostname to inject arbitrary OS commands, leading to remote code execution in the discovery worker context.
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:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
librenms librenms 23.10.0 ~ 26.4.0 -

II. Public POCs for CVE-2026-84194

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III. Intelligence Information for CVE-2026-84194

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Other References for CVE-2026-84194 (2)

Same Patch Batch · librenms · 2026-09-01 · 7 CVEs total

CVE-2026-84189 8.1 HIGH LibreNMS before 26.7.0 Stored XSS via Oxidized API
CVE-2026-84190 7.2 HIGH LibreNMS before 26.5.0 Remote Code Execution via AboutController
CVE-2026-84192 7.1 HIGH LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data
CVE-2026-84191 6.1 MEDIUM LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
CVE-2026-84193 5.8 MEDIUM LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP
CVE-2026-84188 4.8 MEDIUM librenms before 26.7.0 Stored XSS via graph_descr settings

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-78

V. Comments for CVE-2026-84194

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