{"id":"CVE-2020-36327","aliases":["GHSA-fp4w-jxhp-m23p"],"url":"https://o3.security/vulnerability/CVE-2020-36327","summary":"Dependency Confusion in Bundler","details":"Bundler 1.16.0 through 2.2.9 and 2.2.11 through 2.2.16 sometimes chooses a dependency source based on the highest gem version number, which means that a rogue gem found at a public source may be chosen, even if the intended choice was a private gem that is a dependency of another private gem that is explicitly depended on by the application. NOTE: it is not correct to use CVE-2021-24105 for every \"Dependency Confusion\" issue in every product.","published":"2021-04-29T03:15:08.710Z","modified":"2026-10-24T10:50:39.067072406Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"RubyGems","name":"bundler","fixedVersion":"2.2.10"},{"ecosystem":"RubyGems","name":"bundler","fixedVersion":"2.2.18"}],"fix":{"url":"https://github.com/rubygems/rubygems/pull/4609","label":"rubygems/rubygems#4609"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/"},{"type":"ADVISORY","url":"https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html"},{"type":"ADVISORY","url":"https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/"},{"type":"REPORT","url":"https://github.com/rubygems/rubygems/issues/3982"},{"type":"FIX","url":"https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105"},{"type":"EVIDENCE","url":"https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36327"},{"type":"WEB","url":"https://github.com/rubygems/rubygems/pull/4609"},{"type":"WEB","url":"https://github.com/rubygems/rubygems/commit/078bf682ac40017b309b5fc69f283ff640e7c129"},{"type":"PACKAGE","url":"https://github.com/rubygems/rubygems"},{"type":"WEB","url":"https://github.com/rubygems/rubygems/blob/master/bundler/CHANGELOG.md#2218-may-25-2021"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/bundler/CVE-2020-36327.yml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL"},{"type":"WEB","url":"https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things"},{"type":"WEB","url":"https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:50:39.067072406Z"}}