{"action":"Upgrade puma to 3.12.6 or later.","affected":[{"fixed":"3.12.6","introduced":"0"},{"fixed":"4.3.5","introduced":"4.0.0"}],"component":"puma","cve_ids":["CVE-2020-11077"],"ecosystem":"RubyGems","epss":0.02877,"exploited":false,"fixed_versions":["3.12.6","4.3.5"],"ghsa_id":"GHSA-w64w-qqph-5gxm","id":"tcs_01M5KENT7S0MRK005499T5D73Y","modified_at":"2026-09-10T03:48:46.431778194Z","published_at":"2020-05-22T14:55:09Z","references":["https://osv.dev/vulnerability/GHSA-w64w-qqph-5gxm","https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm","https://nvd.nist.gov/vuln/detail/CVE-2020-11077","https://github.com/puma/puma","https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22","https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2020-11077.yml","https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html"],"severity":{"label":"medium","score":6.8},"sources":[{"source":"osv","source_id":"GHSA-w64w-qqph-5gxm","url":"https://osv.dev/vulnerability/GHSA-w64w-qqph-5gxm"}],"summary":"HTTP Smuggling via Transfer-Encoding Header in Puma"}