{"id":"CVE-2019-20922","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-20922","generatedAt":"2026-10-27T21:18:21.897Z","title":"Handlebars before 4.4.5 allows Regular Expression Denial of Service (ReDoS) because of eager matching.","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.","published":"2020-09-30T18:15:18.000Z","lastModified":"2026-06-17T02:31:27.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["handlebarsjs/handlebars"],"epss":{"score":0.03691,"percentile":0.89628,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (3.69%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/handlebars-lang/handlebars.js/commit/8d5530ee2c3ea9f0aee3fde310b9f36887d00b8b","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://snyk.io/vuln/SNYK-JS-HANDLEBARS-480388","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.npmjs.com/advisories/1300","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/handlebars-lang/handlebars.js/commit/8d5530ee2c3ea9f0aee3fde310b9f36887d00b8b","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://snyk.io/vuln/SNYK-JS-HANDLEBARS-480388","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.npmjs.com/advisories/1300","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-20922","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}