{"id":"CVE-2026-30662","details":"ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager component. The 'download' method in 'concrete/controllers/backend/file.php' improperly manages memory when creating zip archives. It uses 'ZipArchive::addFromString' combined with 'file_get_contents', which loads the entire content of every selected file into PHP memory. An authenticated attacker can exploit this by requesting a bulk download of large files, triggering an Out-Of-Memory (OOM) condition that causes the PHP-FPM process to terminate (SIGSEGV) and the web server to return a 500 error.","aliases":["GHSA-p68c-rmfh-j48h"],"modified":"2026-07-15T01:49:06.468616607Z","published":"2026-03-24T00:00:00Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30662.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://wang1rrr.github.io/2026/02/11/CVE-Report-ConcreteCMS-DoS/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30662.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30662"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/concretecms/concretecms","events":[{"introduced":"f2a9fc77537f412c3e5a30e46924c07987020dd7"},{"last_affected":"f2a9fc77537f412c3e5a30e46924c07987020dd7"}],"database_specific":{"source":"CPE_STRING","cpe":"cpe:2.3:a:concretecms:concrete_cms:9.4.7:*:*:*:*:*:*:*","extracted_events":[{"introduced":"9.4.7"},{"last_affected":"9.4.7"}]}}],"versions":["9.4.7"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30662.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}