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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.8 · bundler, fedoraproject, microsoftNVD modified 2026-10-08 21:17
Affected (CPE criteria) 3
cpe:2.3:a:bundler:bundler:*:*:*:*:*:ruby:*:*cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*cpe:2.3:a:microsoft:package_manager_configurations:-:*:*:*:*:*:*:*
References 12
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory
- https://github.com/rubygems/rubygems/issues/3982 Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
- https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/ Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory
- https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ Exploit, Third Party Advisory
- https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html Vendor Advisory
- https://github.com/rubygems/rubygems/issues/3982 Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/
- https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/ Third Party Advisory
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105 Patch, Vendor Advisory
- https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ Exploit, Third Party Advisory