High 8.8Published Apr 28, 2021

CVE-2020-36327Bundler 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 chos…

Updated under an hour ago (Oct 27, 2026, 7:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Modified
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

bundler bundler bundler:bundler	from 1.16.0 before 2.2.10; from 2.2.11 through 2.2.16	NVD
fedoraproject fedora fedoraproject:fedora	34	NVD
microsoft package_manager_configurations microsoft:package_manager_configurations	all versions	NVD

References

References

https://github.com/rubygems/rubygems/issues/3982	x-refsource-misc
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105	x-refsource-misc
https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html	x-refsource-misc
https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/	x-refsource-misc
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/	x-refsource-misc
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/	vendor-advisory, x-refsource-fedora

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.