{"id":"CVE-2016-4423","details":"The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.","aliases":["GHSA-whgv-8cg3-7hcm"],"modified":"2026-08-07T11:47:45.181406966Z","published":"2016-06-01T22:59:02.457Z","database_specific":{"unresolved_ranges":[{"vendor_product":"debian:debian_linux","cpes":["cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"8.0"},{"last_affected":"8.0"}],"source":"CPE_STRING"}]},"references":[{"type":"ADVISORY","url":"http://www.debian.org/security/2016/dsa-3588"},{"type":"ADVISORY","url":"https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session"},{"type":"FIX","url":"https://github.com/symfony/symfony/pull/18733"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/security-http","events":[{"introduced":"de2f3d51160791ef254010953dbde178fee9845f"},{"last_affected":"93431d2843a498bb3c1e84bae4cf8f321efd9e01"}],"database_specific":{"source":"CPE_STRING","cpe":["cpe:2.3:a:sensiolabs:symfony:2.7.0:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.1:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.2:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.3:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.4:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.5:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.6:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.7:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.8:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.9:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.10:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.11:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.12:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.4:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.5:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.0:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.1:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.2:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.3:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.4:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:3.0.5:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"2.7.0"},{"last_affected":"2.7.0"},{"introduced":"2.7.1"},{"last_affected":"2.7.1"},{"introduced":"2.7.2"},{"last_affected":"2.7.2"},{"introduced":"2.7.3"},{"last_affected":"2.7.3"},{"introduced":"2.7.4"},{"last_affected":"2.7.4"},{"introduced":"2.7.5"},{"last_affected":"2.7.5"},{"introduced":"2.7.6"},{"last_affected":"2.7.6"},{"introduced":"2.7.7"},{"last_affected":"2.7.7"},{"introduced":"2.7.8"},{"last_affected":"2.7.8"},{"introduced":"2.7.9"},{"last_affected":"2.7.9"},{"introduced":"2.7.10"},{"last_affected":"2.7.10"},{"introduced":"2.7.11"},{"last_affected":"2.7.11"},{"introduced":"2.7.12"},{"last_affected":"2.7.12"},{"introduced":"2.8.0"},{"last_affected":"2.8.0"},{"introduced":"2.8.1"},{"last_affected":"2.8.1"},{"introduced":"2.8.2"},{"last_affected":"2.8.2"},{"introduced":"2.8.3"},{"last_affected":"2.8.3"},{"introduced":"2.8.4"},{"last_affected":"2.8.4"},{"introduced":"2.8.5"},{"last_affected":"2.8.5"},{"introduced":"3.0.0"},{"last_affected":"3.0.0"},{"introduced":"3.0.1"},{"last_affected":"3.0.1"},{"introduced":"3.0.2"},{"last_affected":"3.0.2"},{"introduced":"3.0.3"},{"last_affected":"3.0.3"},{"introduced":"3.0.4"},{"last_affected":"3.0.4"},{"introduced":"3.0.5"},{"last_affected":"3.0.5"}]}}],"versions":["2.7.0","2.7.1","2.7.10","2.7.11","2.7.12","2.7.2","2.7.3","2.7.4","2.7.5","2.7.6","2.7.7","2.7.8","2.7.9","2.8.0","2.8.1","2.8.2","2.8.3","2.8.4","2.8.5","3.0.0","3.0.1","3.0.2","3.0.4","3.0.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-4423.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/symfony","events":[{"introduced":"0"},{"last_affected":"7bcb5deb31d2ba005dcf97f731fac64e46922f95"},{"introduced":"9975b1eca3de4db792a2c3e4e16f676a4aadcd46"},{"last_affected":"10c83b58fbb42be516377de54962a758695ad964"}],"database_specific":{"cpe":["cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.0:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.1:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.2:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.3:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.4:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.5:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.6:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.7:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.8:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.9:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.10:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.11:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.7.12:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.0:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.1:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.2:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.3:*:*:*:*:*:*:*","cpe:2.3:a:sensiolabs:symfony:2.8.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