{"cve":"CVE-2021-33502","nvd":{"published":"2021-05-24T16:15:08.133","modified":"2026-06-17T03:54:41.273","status":"Modified","description":"The normalize-url package before 4.5.1, 5.x before 5.3.1, and 6.x before 6.0.1 for Node.js has a ReDoS (regular expression denial of service) issue because it has exponential performance for data: URLs.","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-1333"],"references":["https://github.com/sindresorhus/normalize-url/releases/tag/v6.0.1","https://security.netapp.com/advisory/ntap-20210706-0001/","https://github.com/sindresorhus/normalize-url/releases/tag/v6.0.1","https://security.netapp.com/advisory/ntap-20210706-0001/"],"products":["normalize-url_project:normalize-url"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-33502","score":0.01705,"percentile":0.77287,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-px4h-xg32-q955","url":"https://osv.dev/vulnerability/GHSA-px4h-xg32-q955","summary":"ReDoS in normalize-url","modified":"2023-11-08T04:06:04.745015Z","packages":[{"ecosystem":"npm","name":"normalize-url","purl":"pkg:npm/normalize-url","ranges":[">=4.3.0 <4.5.1"],"fixed":["4.5.1"]},{"ecosystem":"npm","name":"normalize-url","purl":"pkg:npm/normalize-url","ranges":[">=5.0.0 <5.3.1"],"fixed":["5.3.1"]},{"ecosystem":"npm","name":"normalize-url","purl":"pkg:npm/normalize-url","ranges":[">=6.0.0 <6.0.1"],"fixed":["6.0.1"]}]}],"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."]}