usn-8456-1
Vulnerability from osv_ubuntu
Published
2026-06-22 12:09
Modified
2026-07-15 17:24
Summary
libxml2 vulnerability
Details

Geoffrey Humphreys discovered that libxml2 had a use after free when parsing the internal subset of a DTD. A remote attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary code.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-6653",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
          },
          {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
          },
          {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libxml2",
        "purl": "pkg:deb/ubuntu/libxml2@2.9.13+dfsg-1ubuntu0.12?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.13+dfsg-1ubuntu0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.12+dfsg-4",
        "2.9.12+dfsg-5",
        "2.9.12+dfsg-6",
        "2.9.13+dfsg-1",
        "2.9.13+dfsg-1build1",
        "2.9.13+dfsg-1ubuntu0.1",
        "2.9.13+dfsg-1ubuntu0.2",
        "2.9.13+dfsg-1ubuntu0.3",
        "2.9.13+dfsg-1ubuntu0.4",
        "2.9.13+dfsg-1ubuntu0.5",
        "2.9.13+dfsg-1ubuntu0.6",
        "2.9.13+dfsg-1ubuntu0.7",
        "2.9.13+dfsg-1ubuntu0.8",
        "2.9.13+dfsg-1ubuntu0.9",
        "2.9.13+dfsg-1ubuntu0.10",
        "2.9.13+dfsg-1ubuntu0.11"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-6653",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
          },
          {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
          },
          {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libxml2",
        "purl": "pkg:deb/ubuntu/libxml2@2.9.14+dfsg-1.3ubuntu3.8?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.14+dfsg-1.3ubuntu3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.14+dfsg-1.3",
        "2.9.14+dfsg-1.3build1",
        "2.9.14+dfsg-1.3build2",
        "2.9.14+dfsg-1.3build3",
        "2.9.14+dfsg-1.3ubuntu1",
        "2.9.14+dfsg-1.3ubuntu2",
        "2.9.14+dfsg-1.3ubuntu3",
        "2.9.14+dfsg-1.3ubuntu3.1",
        "2.9.14+dfsg-1.3ubuntu3.2",
        "2.9.14+dfsg-1.3ubuntu3.3",
        "2.9.14+dfsg-1.3ubuntu3.4",
        "2.9.14+dfsg-1.3ubuntu3.5",
        "2.9.14+dfsg-1.3ubuntu3.6",
        "2.9.14+dfsg-1.3ubuntu3.7"
      ]
    }
  ],
  "aliases": [],
  "details": "Geoffrey Humphreys discovered that libxml2 had a use after free when\nparsing the internal subset of a DTD. A remote attacker could possibly use\nthis issue to cause a denial of service or possibly execute arbitrary code.",
  "id": "USN-8456-1",
  "modified": "2026-07-15T17:24:56Z",
  "published": "2026-06-22T12:09:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8456-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6653"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "libxml2 vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-6653"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.