{"id":"USN-8456-1","summary":"libxml2 vulnerability","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.","modified":"2026-07-15T19:45:21.751688038Z","published":"2026-06-22T12:09:55Z","related":["UBUNTU-CVE-2026-6653"],"upstream":["UBUNTU-CVE-2026-6653"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8456-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6653"}],"affected":[{"package":{"name":"libxml2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.13+dfsg-1ubuntu0.12"}]}],"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"],"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_version":"2.9.13+dfsg-1ubuntu0.12","binary_name":"python3-libxml2"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-6653","severity":[{"type":"CVSS_V4","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_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8456-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.14+dfsg-1.3ubuntu3.8"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"libxml2","binary_version":"2.9.14+dfsg-1.3ubuntu3.8"},{"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"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","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_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-6653"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8456-1.json"}}],"schema_version":"1.7.5"}