{"id":"UBUNTU-CVE-2026-6653","details":"Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.","modified":"2026-07-15T19:47:01.762730188Z","published":"2026-06-22T00:00:00Z","related":["USN-8456-1"],"upstream":["CVE-2026-6653"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-6653"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-6653"},{"type":"REPORT","url":"https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1058"},{"type":"REPORT","url":"https://bugs.launchpad.net/ubuntu/+source/libxml2/+bug/2141260"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8456-1"}],"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":{"binaries":[{"binary_name":"libxml2","binary_version":"2.9.13+dfsg-1ubuntu0.12"},{"binary_version":"2.9.13+dfsg-1ubuntu0.12","binary_name":"libxml2-utils"},{"binary_name":"python3-libxml2","binary_version":"2.9.13+dfsg-1ubuntu0.12"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6653.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_version":"2.9.14+dfsg-1.3ubuntu3.8","binary_name":"libxml2"},{"binary_version":"2.9.14+dfsg-1.3ubuntu3.8","binary_name":"libxml2-utils"},{"binary_name":"python3-libxml2","binary_version":"2.9.14+dfsg-1.3ubuntu3.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6653.json"}}],"schema_version":"1.7.5","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"}]}