{"cve":"CVE-2020-11076","nvd":{"published":"2020-05-22T15:15:11.363","modified":"2026-06-17T02:48:59.913","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-444"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html","https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22","https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd","https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h"],"products":["debian:debian_linux","fedoraproject:fedora","puma:puma"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-11076","score":0.04088,"percentile":0.90724,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-x7jg-6pwg-fx5h","url":"https://osv.dev/vulnerability/GHSA-x7jg-6pwg-fx5h","summary":"HTTP Smuggling via Transfer-Encoding Header in Puma","modified":"2026-09-10T03:47:45.269704455Z","packages":[{"ecosystem":"RubyGems","name":"puma","purl":"pkg:gem/puma","ranges":["<3.12.5"],"fixed":["3.12.5"]},{"ecosystem":"RubyGems","name":"puma","purl":"pkg:gem/puma","ranges":[">=4.0.0 <4.3.4"],"fixed":["4.3.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}