vuln-ubuntu/data/osv/usn/USN-4896-1.json

{
  "schema_version": "1.7.0",
  "id": "USN-4896-1",
  "summary": "lxml vulnerability",
  "details": "It was discovered that lxml incorrectly handled certain HTML attributes. A\nremote attacker could possibly use this issue to perform cross-site\nscripting (XSS) attacks.\n",
  "aliases": [],
  "upstream": [
    "UBUNTU-CVE-2021-28957"
  ],
  "related": [],
  "published": "2021-03-30T16:24:59Z",
  "modified": "2026-02-10T04:42:07Z",
  "affected": [
    {
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@3.5.0-1ubuntu0.4?arch=source&distro=xenial"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.0-1ubuntu0.4"
            }
          ]
        }
      ],
      "versions": [
        "3.4.4-1",
        "3.5.0-1",
        "3.5.0-1build1",
        "3.5.0-1ubuntu0.1",
        "3.5.0-1ubuntu0.2",
        "3.5.0-1ubuntu0.3"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "3.5.0-1ubuntu0.4"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "3.5.0-1ubuntu0.4"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:16.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-28957",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@4.2.1-1ubuntu0.4?arch=source&distro=bionic"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.1-1ubuntu0.4"
            }
          ]
        }
      ],
      "versions": [
        "4.0.0-1",
        "4.1.0-1",
        "4.2.0-1",
        "4.2.1-1",
        "4.2.1-1ubuntu0.1",
        "4.2.1-1ubuntu0.2",
        "4.2.1-1ubuntu0.3"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "4.2.1-1ubuntu0.4"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "4.2.1-1ubuntu0.4"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:18.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-28957",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "lxml",
        "purl": "pkg:deb/ubuntu/lxml@4.5.0-1ubuntu0.3?arch=source&distro=focal"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.0-1ubuntu0.3"
            }
          ]
        }
      ],
      "versions": [
        "4.4.1-1",
        "4.4.1-1build1",
        "4.4.2-1",
        "4.5.0-1",
        "4.5.0-1ubuntu0.1",
        "4.5.0-1ubuntu0.2"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-lxml",
            "binary_version": "4.5.0-1ubuntu0.3"
          },
          {
            "binary_name": "python3-lxml",
            "binary_version": "4.5.0-1ubuntu0.3"
          }
        ],
        "availability": "No subscription required"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:20.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-28957",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4896-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-28957"
    }
  ]
}