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TI-2026-39866 Aliases CVE-2026-55182GHSA-c9fv-cgmm-2wg7

LibreNMS: Remote Code Execution by Signal Alert Transportation Module

Priority HIGH 72CWE-77Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-77.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01607 76th percentileScored 2026-11-07
Fix Fixed librenms (librenms): 26.5.0librenms/librenms (Packagist): 26.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
librenmslibrenms21.6.0 to before 26.5.026.5.0Patch availableCNA
—librenms/librenms (Packagist)21.6.0 to before 26.5.026.5.0Patch availableGHSA-c9fv-cgmm-2wg7
  • librenms Vendorlibrenms Affected 21.6.0 to before 26.5.0 Fixed in 26.5.0 Patch available CNA
  • librenms/librenms (Packagist) Vendor— Affected 21.6.0 to before 26.5.0 Fixed in 26.5.0 Patch available GHSA-c9fv-cgmm-2wg7

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:*——librenms
  • cpe:2.3:a:librenms:librenms:*:*:*:*:*:*:*:* Versions — — ·librenms

Remediation

  • Fix · CNA librenms (librenms) Fixed in 26.5.0
  • Fix · GHSA-c9fv-cgmm-2wg7 librenms/librenms (Packagist) Fixed in 26.5.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55182
  2. 2026-10-03 Alias added: GHSA-c9fv-cgmm-2wg7

References

Other 4

  • TI-2018-14479 LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the… CVSS 3.0CRITICAL 9.8
  • TI-2026-71173 LDAP filter injection in LibreNMS allows authentication bypass CVSS 4.0CRITICAL 9.2
  • TI-2026-59134 LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion CVSS 4.0CRITICAL 9.2
  • TI-2026-57885 LibreNMS before 26.7.0 Stored XSS via Oxidized API CVSS 4.0CRITICAL 9.2
  • TI-2022-03735 Insufficient Session Expiration in librenms/librenms CVSS 3.1CRITICAL 9.8
  • TI-2026-57886 LibreNMS before 26.5.0 Remote Code Execution via AboutController CVSS 4.0HIGH 8.7
See all 123 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences