{"cve":"CVE-2019-20922","nvd":{"published":"2020-09-30T18:15:18.100","modified":"2026-06-17T02:31:26.647","status":"Modified","description":"Handlebars before 4.4.5 allows Regular Expression Denial of Service (ReDoS) because of eager matching. The parser may be forced into an endless loop while processing crafted templates. This may allow attackers to exhaust system resources.","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:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/handlebars-lang/handlebars.js/commit/8d5530ee2c3ea9f0aee3fde310b9f36887d00b8b","https://snyk.io/vuln/SNYK-JS-HANDLEBARS-480388","https://www.npmjs.com/advisories/1300","https://github.com/handlebars-lang/handlebars.js/commit/8d5530ee2c3ea9f0aee3fde310b9f36887d00b8b","https://snyk.io/vuln/SNYK-JS-HANDLEBARS-480388"],"products":["handlebarsjs:handlebars"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2019-20922","score":0.03691,"percentile":0.89706,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-62gr-4qp9-h98f","url":"https://osv.dev/vulnerability/GHSA-62gr-4qp9-h98f","summary":"Regular Expression Denial of Service in Handlebars","modified":"2026-07-08T06:49:32.364286317Z","packages":[{"ecosystem":"npm","name":"handlebars","purl":"pkg:npm/handlebars","ranges":[">=4.0.0 <4.4.5"],"fixed":["4.4.5"]}]}],"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."]}