{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55182","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T15:20:43.086Z","datePublished":"2026-08-26T21:50:04.014Z","dateUpdated":"2026-08-27T13:47:10.632Z"},"containers":{"cna":{"title":"LibreNMS: Remote Code Execution by Signal Alert Transportation Module","problemTypes":[{"descriptions":[{"cweId":"CWE-77","lang":"en","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","type":"CWE"}]}],"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"}}],"references":[{"name":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/librenms/librenms/security/advisories/GHSA-c9fv-cgmm-2wg7"},{"name":"https://github.com/librenms/librenms/commit/868e3b966a","tags":["x_refsource_MISC"],"url":"https://github.com/librenms/librenms/commit/868e3b966a"},{"name":"https://github.com/librenms/librenms/releases/tag/26.5.0","tags":["x_refsource_MISC"],"url":"https://github.com/librenms/librenms/releases/tag/26.5.0"}],"affected":[{"vendor":"librenms","product":"librenms","versions":[{"version":">= 21.6.0, < 26.5.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-26T21:50:04.014Z"},"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."}],"source":{"advisory":"GHSA-c9fv-cgmm-2wg7","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-27T13:47:10.632Z"}}]}}