{"id":"CVE-2021-28965","aliases":["BIT-ruby-2021-28965","BIT-ruby-min-2021-28965","GHSA-8cr8-4vfw-mr7h"],"url":"https://o3.security/vulnerability/CVE-2021-28965","summary":"REXML round-trip instability","details":"The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and serializing.","published":"2021-04-21T07:15:07.677Z","modified":"2026-10-24T10:30:36.462263384Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"rexml","fixedVersion":"3.2.5"}],"fix":{"url":"https://github.com/ruby/rexml/commit/2fe62e29094d95921d7e19abbd2e26b23d78dc5b","label":"ruby/rexml@2fe62e2"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WTVFTLFVCSUE5CXHINJEUCKSHU4SWDMT/"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210528-0003/"},{"type":"ADVISORY","url":"https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28965"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/2fe62e29094d95921d7e19abbd2e26b23d78dc5b"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/3c137eb119550874b2b3e27d12b733ca67033377"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/6a250d2cd1194c2be72becbdd9c3e770aa16e752"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/9b311e59ae05749e082eb6bbefa1cb620d1a786e"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/a659c63e37414506dfb0d4655e031bb7a2e73fc8"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/f7bab8937513b1403cea5aff874cbf32fd5e8551"},{"type":"WEB","url":"https://github.com/ruby/rexml/commit/f9d88e4948b4a43294c25dc0edb16815bd9d8618"},{"type":"WEB","url":"https://hackerone.com/reports/1104077"},{"type":"PACKAGE","url":"https://github.com/ruby/rexml"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2021-28965.yml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WTVFTLFVCSUE5CXHINJEUCKSHU4SWDMT"},{"type":"WEB","url":"https://rubygems.org/gems/rexml"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210528-0003"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2021/04/05/xml-round-trip-vulnerability-in-rexml-cve-2021-28965"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:30:36.462263384Z"}}