{"id":"CVE-2020-11076","aliases":["GHSA-x7jg-6pwg-fx5h"],"url":"https://o3.security/vulnerability/CVE-2020-11076","summary":"HTTP Smuggling via Transfer-Encoding Header in Puma","details":"In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.","published":"2020-05-22T15:15:11.363Z","modified":"2026-08-07T11:48:22.576581955Z","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":null,"affectedPackages":[{"ecosystem":"RubyGems","name":"puma","fixedVersion":"3.12.5"},{"ecosystem":"RubyGems","name":"puma","fixedVersion":"4.3.4"}],"fix":{"url":"https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd","label":"puma/puma@f24d552"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html"},{"type":"ADVISORY","url":"https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22"},{"type":"ADVISORY","url":"https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html"},{"type":"FIX","url":"https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:48:22.576581955Z"}}