{"cve":"CVE-2019-19919","nvd":{"published":"2019-12-20T23:15:11.480","modified":"2026-06-17T02:27:27.147","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-1321"],"references":["https://www.npmjs.com/advisories/1164","https://www.tenable.com/security/tns-2021-14","https://www.npmjs.com/advisories/1164","https://www.tenable.com/security/tns-2021-14"],"products":["handlebars.js_project:handlebars.js","tenable:tenable.sc"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2019-19919","score":0.07066,"percentile":0.9421,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-w457-6q6x-cgp9","url":"https://osv.dev/vulnerability/GHSA-w457-6q6x-cgp9","summary":"Prototype Pollution in handlebars","modified":"2026-09-10T03:49:25.089815783Z","packages":[{"ecosystem":"npm","name":"handlebars","purl":"pkg:npm/handlebars","ranges":[">=4.0.0 <4.3.0"],"fixed":["4.3.0"]},{"ecosystem":"RubyGems","name":"bootstrap-wysihtml5-rails","purl":"pkg:gem/bootstrap-wysihtml5-rails","ranges":[">=0.3.3.5 <=0.3.3.8"],"fixed":[]},{"ecosystem":"npm","name":"handlebars","purl":"pkg:npm/handlebars","ranges":["<3.0.8"],"fixed":["3.0.8"]}]}],"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."]}