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Vulnerability record · CVE-2020-36327 · published 29 April 2021

CVE-2020-36327: Bundler vulnerability

Bundler · Bundler

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.

8.8 CVSS 3.1 High EPSS 6.3% · top 6.6%
8.8CVSS 3.1 base score, v2 9.3
6.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 ExploitIssue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3
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 PatchVendor Advisory
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ ExploitThird 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 ExploitIssue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3
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 PatchVendor Advisory
https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/ ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-36327), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.