{"id":"CVE-2019-18888","aliases":["GHSA-xhh6-956q-4q69"],"url":"https://o3.security/vulnerability/CVE-2019-18888","summary":"Argument injection in a MimeTypeGuesser in Symfony","details":"An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. If an application passes unvalidated user input as the file for which MIME type validation should occur, then arbitrary arguments are passed to the underlying file command. This is related to symfony/http-foundation (and symfony/mime in 4.3.x).","published":"2019-11-21T23:15:13.530Z","modified":"2026-08-07T11:48:05.238999036Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"2.8.52"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"3.4.35"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"4.2.12"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"4.3.8"},{"ecosystem":"Packagist","name":"symfony/mime","fixedVersion":"4.3.8"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"2.8.52"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"3.4.35"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"4.2.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"4.3.8"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ/"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/releases/tag/v4.3.8"},{"type":"ADVISORY","url":"https://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser"},{"type":"ADVISORY","url":"https://symfony.com/blog/symfony-4-3-8-released"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-18888"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2019-18888.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mime/CVE-2019-18888.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18888.yaml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ"},{"type":"WEB","url":"https://symfony.com/cve-2019-18888"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:05.238999036Z"}}