CVE-2026-55182
High · CVSS 8.6Published 2026-08-26
CVSS
8.6
High
EPSS
1.1%
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-55182?
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.
CVSS Score Explained
CVSS 8.6 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
EPSS 1.1% — moderate real-world exploitation. Worth prioritizing but not emergency response.
References & Patches
- ›https://github.com/librenms/librenms/commit/868e3b966a
- PATCHhttps://github.com/librenms/librenms/releases/tag/26.5.0
- ›https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7
- ›https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7
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