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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是LibreNMS社区开源的一款网络监控系统。 LibreNMS 23.10.0版本至26.2.0之前版本存在命令注入漏洞，该漏洞源于libvirt discovery功能将设备主机名连接到shell命令时未进行安全转义，可能导致经过身份验证的管理员通过特制主机名注入任意OS命令，造成远程代码执行。

CVSS 8.6 · High EPSS 1.53% · P74

Affected Version Matrix 2

VendorProduct Version RangeStatus
librenms librenms 23.10.0< 26.4.0 affected
26.4.0 unaffected
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I. Basic Information for CVE-2026-84194

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
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 23.10.0版本至26.2.0之前版本存在命令注入漏洞，该漏洞源于libvirt discovery功能将设备主机名连接到shell命令时未进行安全转义，可能导致经过身份验证的管理员通过特制主机名注入任意OS命令，造成远程代码执行。
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 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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Vendor Advisories 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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