{"id":"CVE-2021-41817","aliases":["BIT-ruby-2021-41817","BIT-ruby-min-2021-41817","GHSA-qg54-694p-wgpp"],"url":"https://o3.security/vulnerability/CVE-2021-41817","summary":"Regular expression denial of service vulnerability (ReDoS) in date","details":"Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1.","published":"2022-01-01T05:15:08.197Z","modified":"2026-07-08T23:46:28.286834Z","cvss":{"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"},"epss":{"score":0.03222,"percentile":0.87269,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"RubyGems","name":"date","fixedVersion":"3.2.1"},{"ecosystem":"RubyGems","name":"date","fixedVersion":"3.1.2"},{"ecosystem":"RubyGems","name":"date","fixedVersion":"3.0.2"},{"ecosystem":"RubyGems","name":"date","fixedVersion":"2.0.1"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202401-27"},{"type":"REPORT","url":"https://hackerone.com/reports/1254844"},{"type":"EVIDENCE","url":"https://www.ruby-lang.org/en/news/2021/11/15/date-parsing-method-regexp-dos-cve-2021-41817/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T23:46:28.286834Z"}}