CVE-2020-36327 (GCVE-0-2020-36327)

Vulnerability from cvelistv5 – Published: 2021-04-29 02:28 – Updated: 2026-10-08 21:03
VLAI
Summary
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:02 UTC
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 28/100 over 2309 records in the last 180 days details
References
Show details on NVD website
To clipboard 

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                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-08T21:02:42.958558Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2021-04-29T03:15:08.710",
        "references": [
          {
            "source": "cve@mitre.org",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://github.com/rubygems/rubygems/issues/3982"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://bundler.io/blog/2021/02/15/a-more-secure-bundler-we-fixed-our-source-priorities.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://github.com/rubygems/rubygems/issues/3982"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MWXHK5UUHVSHF7HTHMX6JY3WXDVNIHSL/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://mensfeld.pl/2021/02/rubygems-dependency-confusion-attack-side-of-things/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch",
              "Vendor Advisory"
            ],
            "url": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-24105"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://www.zofrex.com/blog/2021/04/29/bundler-still-vulnerable-dependency-confusion-cve-2020-36327/"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-08T22:48:18+00:00",
      "cve": "CVE-2020-36327",
      "id": "CVE-2020-36327",
      "initial_release_date": "2020-01-01T00:00:00+00:00",
      "product_status:fixed": "435",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "1054",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "rubygem-bundler: Dependencies of gems with explicit source may be installed from a different source",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-36327.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-11T02:09:10Z",
      "cve": "CVE-2020-36327",
      "id": "CVE-2020-36327",
      "initial_release_date": "2023-02-15T03:50:46Z",
      "product_status:known_affected": "496",
      "product_status:known_not_affected": "17",
      "product_status:recommended": "61",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-36327",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-36327.json",
      "version": "26"
    }
  }
}



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Sightings

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Nomenclature

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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Vulnerability timeline

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