usn-4922-1
Vulnerability from osv_ubuntu
Published
2021-04-20 17:01
Modified
2026-04-22 07:36
Summary
ruby2.3, ruby2.5, ruby2.7 vulnerability
Details

Juho Nurminen discovered that the REXML gem bundled with Ruby incorrectly parsed and serialized XML documents. A remote attacker could possibly use this issue to perform an XML round-trip attack.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-28965",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libruby2.3",
            "binary_version": "2.3.1-2~ubuntu16.04.16"
          },
          {
            "binary_name": "ruby2.3",
            "binary_version": "2.3.1-2~ubuntu16.04.16"
          },
          {
            "binary_name": "ruby2.3-tcltk",
            "binary_version": "2.3.1-2~ubuntu16.04.16"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ruby2.3",
        "purl": "pkg:deb/ubuntu/ruby2.3@2.3.1-2~ubuntu16.04.16?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.1-2~ubuntu16.04.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0-1",
        "2.3.0-2",
        "2.3.0-4ubuntu2",
        "2.3.0-4ubuntu3",
        "2.3.0-5ubuntu1",
        "2.3.1-2~16.04",
        "2.3.1-2~16.04.2",
        "2.3.1-2~16.04.4",
        "2.3.1-2~16.04.5",
        "2.3.1-2~16.04.6",
        "2.3.1-2~16.04.7",
        "2.3.1-2~16.04.9",
        "2.3.1-2~16.04.10",
        "2.3.1-2~16.04.11",
        "2.3.1-2~16.04.12",
        "2.3.1-2~ubuntu16.04.13",
        "2.3.1-2~ubuntu16.04.14",
        "2.3.1-2~ubuntu16.04.15"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-28965",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libruby2.5",
            "binary_version": "2.5.1-1ubuntu1.9"
          },
          {
            "binary_name": "ruby2.5",
            "binary_version": "2.5.1-1ubuntu1.9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ruby2.5",
        "purl": "pkg:deb/ubuntu/ruby2.5@2.5.1-1ubuntu1.9?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.1-1ubuntu1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.0~preview1-1ubuntu2",
        "2.5.0-4ubuntu1",
        "2.5.0-4ubuntu4",
        "2.5.0-5ubuntu1",
        "2.5.0-6ubuntu1",
        "2.5.1-1ubuntu1",
        "2.5.1-1ubuntu1.1",
        "2.5.1-1ubuntu1.2",
        "2.5.1-1ubuntu1.4",
        "2.5.1-1ubuntu1.5",
        "2.5.1-1ubuntu1.6",
        "2.5.1-1ubuntu1.7",
        "2.5.1-1ubuntu1.8"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-28965",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libruby2.7",
            "binary_version": "2.7.0-5ubuntu1.4"
          },
          {
            "binary_name": "ruby2.7",
            "binary_version": "2.7.0-5ubuntu1.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ruby2.7",
        "purl": "pkg:deb/ubuntu/ruby2.7@2.7.0-5ubuntu1.4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.0-5ubuntu1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.7.0-1",
        "2.7.0-2",
        "2.7.0-3",
        "2.7.0-4",
        "2.7.0-4ubuntu1",
        "2.7.0-5ubuntu1",
        "2.7.0-5ubuntu1.1",
        "2.7.0-5ubuntu1.2",
        "2.7.0-5ubuntu1.3"
      ]
    }
  ],
  "aliases": [],
  "details": "Juho Nurminen discovered that the REXML gem bundled with Ruby incorrectly\nparsed and serialized XML documents. A remote attacker could possibly use\nthis issue to perform an XML round-trip attack.\n",
  "id": "USN-4922-1",
  "modified": "2026-04-22T07:36:59Z",
  "published": "2021-04-20T17:01:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4922-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-28965"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "ruby2.3, ruby2.5, ruby2.7 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-28965"
  ]
}



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