{"id":"CVE-2019-19919","aliases":["GHSA-w457-6q6x-cgp9"],"url":"https://o3.security/vulnerability/CVE-2019-19919","summary":"Prototype Pollution in handlebars","details":"Versions of handlebars prior to 4.3.0 are vulnerable to Prototype Pollution leading to Remote Code Execution. Templates may alter an Object's __proto__ and __defineGetter__ properties, which may allow an attacker to execute arbitrary code through crafted payloads.","published":"2019-12-20T23:15:11.480Z","modified":"2026-08-27T03:48:29.712572039Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"handlebars","fixedVersion":"4.3.0"},{"ecosystem":"npm","name":"handlebars","fixedVersion":"3.0.8"},{"ecosystem":"RubyGems","name":"bootstrap-wysihtml5-rails","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.npmjs.com/advisories/1164"},{"type":"FIX","url":"https://www.tenable.com/security/tns-2021-14"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T03:48:29.712572039Z"}}