{"action":"Upgrade symfony/symfony to 4.4.7 or later.","affected":[{"fixed":"4.4.7","introduced":"4.4.0"},{"fixed":"5.0.7","introduced":"5.0.0"}],"component":"symfony/symfony","cve_ids":["CVE-2020-5255"],"ecosystem":"Packagist","epss":0.01297,"exploited":false,"fixed_versions":["4.4.7","5.0.7"],"ghsa_id":"GHSA-mcx4-f5f5-4859","id":"tcs_01M5KF5ET413072JAEV7HJW42A","modified_at":"2026-09-10T03:48:29.528668079Z","published_at":"2020-03-30T20:09:16Z","references":["https://osv.dev/vulnerability/GHSA-mcx4-f5f5-4859","https://github.com/symfony/symfony/security/advisories/GHSA-mcx4-f5f5-4859","https://nvd.nist.gov/vuln/detail/CVE-2020-5255","https://github.com/symfony/symfony/commit/dca343442e6a954f96a2609e7b4e9c21ed6d74e6","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2020-5255.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2020-5255.yaml","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/C36JLPHUPKDFAX6D5WYFC4ALO2K7RDUQ","https://symfony.com/blog/cve-2020-5255-prevent-cache-poisoning-via-a-response-content-type-header","https://symfony.com/cve-2020-5255"],"severity":{"label":"low","score":2.6},"sources":[{"source":"osv","source_id":"GHSA-mcx4-f5f5-4859#Packagist/symfony/symfony","url":"https://osv.dev/vulnerability/GHSA-mcx4-f5f5-4859"}],"summary":"Prevent cache poisoning via a Response Content-Type header in Symfony"}