{"id":"CVE-2026-55182","state":"PUBLISHED","title":"LibreNMS: Remote Code Execution by Signal Alert Transportation Module","description":"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.","publishedAt":"2026-08-26T21:50:04.014Z","updatedAt":"2026-08-27T13:47:10.632Z","severity":{"score":8.6,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["librenms librenms"],"affected":[{"vendor":"librenms","product":"librenms","versions":[{"version":">= 21.6.0, < 26.5.0","status":"affected"}]}],"references":["https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7","https://github.com/librenms/librenms/commit/868e3b966a","https://github.com/librenms/librenms/releases/tag/26.5.0"],"weaknesses":["CWE-77"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55182.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55182","state":"PUBLISHED","datePublished":"2026-08-26T21:50:04.014Z","dateUpdated":"2026-08-27T13:47:10.632Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T15:20:43.086Z"},"containers":{"cna":{"title":"LibreNMS: Remote Code Execution by Signal Alert Transportation Module","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"librenms","product":"librenms","versions":[{"version":">= 21.6.0, < 26.5.0","status":"affected"}]}],"references":[{"url":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7","name":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/librenms/librenms/commit/868e3b966a","name":"https://github.com/librenms/librenms/commit/868e3b966a","tags":["x_refsource_MISC"]},{"url":"https://github.com/librenms/librenms/releases/tag/26.5.0","name":"https://github.com/librenms/librenms/releases/tag/26.5.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-77","lang":"en","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-26T21:50:04.014Z"},"source":{"advisory":"GHSA-c9fv-cgmm-2wg7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T13:47:03.373245Z","id":"CVE-2026-55182","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T13:47:10.632Z"}}]}}}