{"id":"CVE-2026-55182","summary":"LibreNMS: Remote Code Execution by Signal Alert Transportation Module","details":"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.","aliases":["GHSA-c9fv-cgmm-2wg7"],"modified":"2026-08-28T03:47:02.803193817Z","published":"2026-08-26T21:50:04.014Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-77"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55182.json"},"references":[{"type":"WEB","url":"https://github.com/librenms/librenms/releases/tag/26.5.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55182.json"},{"type":"ADVISORY","url":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55182"},{"type":"FIX","url":"https://github.com/librenms/librenms/commit/868e3b966a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/librenms/librenms","events":[{"introduced":"fb2608ee3dafbaaeba51421fed1d221218699c39"},{"fixed":"868e3b966a"},{"fixed":"403fa2ddf262d4cbd7e1748ed7678468cc7248d1"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"21.6.0"},{"fixed":"26.5.0"}]}}],"versions":["26.4.1","26.4.0","26.3.1","26.3.0","26.2.0","26.1.0","25.12.0","25.11.0","25.10.0","25.9.0","25.8.0","25.7.0","25.6.0","25.5.0","25.4.0","25.3.0","25.2.0","25.1.0","24.12.0","24.11.0","24.10.1","24.10.0","24.9.1","24.9.0","24.8.0","24.7.0","24.6.0","24.5.0","24.4.1","24.4.0","24.3.0","24.2.0","24.1.0","23.11.0","23.10.0","23.9.1","23.9.0","23.8.2","23.8.1","23.8.0","23.7.0","23.6.0","23.5.0","23.4.1","23.4.0","23.2.0","23.1.0","22.12.0","22.11.0","22.10.0","22.9.0","22.8.0","22.7.0","22.6.0","22.5.0","22.4.0","22.3.0","22.2.1","22.2.0","22.1.0","21.12.1","21.12.0","21.11.0","21.10.0","21.9.0","21.8.0","21.7.0","21.6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55182.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}