{"id":"CVE-2018-11386","aliases":["GHSA-r2rq-3h56-fqm4"],"url":"https://o3.security/vulnerability/CVE-2018-11386","summary":"Symfony DoS","details":"An issue was discovered in the HttpFoundation component in Symfony 2.7.x before 2.7.48, 2.8.x before 2.8.41, 3.3.x before 3.3.17, 3.4.x before 3.4.11, and 4.0.x before 4.0.11. The PDOSessionHandler class allows storing sessions on a PDO connection. Under some configurations and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.","published":"2018-06-13T16:29:00.627Z","modified":"2026-10-24T10:30:55.716284185Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"2.7.48"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"2.8.41"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"3.3.17"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"3.4.11"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"4.0.11"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"2.7.48"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"2.8.41"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"3.3.17"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"3.4.11"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"4.0.11"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH/"},{"type":"ADVISORY","url":"https://symfony.com/blog/cve-2018-11386-denial-of-service-when-using-pdosessionhandler"},{"type":"ADVISORY","url":"https://www.debian.org/security/2018/dsa-4262"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-11386"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2018-11386.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2018-11386.yaml"},{"type":"PACKAGE","url":"https://github.com/symfony/symfony"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G4XNBMFW33H47O5TZGA7JYCVLDBCXAJV"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBQK7JDXIELADIPGZIOUCZKMAJM5LSBW"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WU5N2TZFNGXDGMXMPP7LZCWTFLENF6WH"},{"type":"WEB","url":"https://symfony.com/cve-2018-11386"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:30:55.716284185Z"}}