{"id":"CVE-2023-23936","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-23936","generatedAt":"2026-10-27T21:44:57.232Z","title":"Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities.","description":"Undici is an HTTP/1.1 client for Node.js. Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities. This issue is patched in Undici v5.19.1. As a workaround, sanitize the `headers.host` string before passing to undici.","published":"2023-02-16T18:15:11.000Z","lastModified":"2026-06-17T05:38:20.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"},"cwe":["CWE-93","CWE-74"],"affected":["nodejs/node.js","nodejs/undici"],"epss":{"score":0.01129,"percentile":0.66156,"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":"low","text":"Lower severity and a low EPSS score (1.13%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/nodejs/undici/releases/tag/v5.19.1","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxff","tags":["Vendor Advisory"],"source":"security-advisories@github.com"},{"url":"https://hackerone.com/reports/1820955","tags":["Exploit","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/nodejs/undici/releases/tag/v5.19.1","tags":["Release Notes"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxff","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://hackerone.com/reports/1820955","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-23936","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."}