{"id":"USN-8023-1","summary":"libxmltok vulnerabilities","details":"It was discovered that Expat, contained within the xmltok library, incorrectly\nhandled the initialization of parsers for external entities. An attacker could\npossibly use this issue to cause a denial of service. (CVE-2026-24515)\n\nIt was discovered that Expat, contained within the xmltok library, incorrectly\nhandled integer calculations when allocating memory for XML tags. An attacker\ncould possibly use this issue to cause a denial of service or execute arbitrary\ncode. (CVE-2026-25210)","modified":"2026-06-25T13:32:31.648265021Z","published":"2026-02-11T10:29:21Z","related":["UBUNTU-CVE-2026-24515","UBUNTU-CVE-2026-25210"],"upstream":["UBUNTU-CVE-2026-24515","UBUNTU-CVE-2026-25210"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8023-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-24515"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-25210"}],"affected":[{"package":{"name":"libxmltok","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libxmltok?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-3ubuntu0.16.04.1~esm5"}]}],"versions":["1.2-3build3","1.2-3ubuntu0.16.04.1~esm1","1.2-3ubuntu0.16.04.1~esm2","1.2-3ubuntu0.16.04.1~esm3","1.2-3ubuntu0.16.04.1~esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"libxmltok1","binary_version":"1.2-3ubuntu0.16.04.1~esm5"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2026-24515","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-25210"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8023-1.json"}},{"package":{"name":"libxmltok","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libxmltok?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.18.04.1~esm6"}]}],"versions":["1.2-4","1.2-4ubuntu0.18.04.1~esm1","1.2-4ubuntu0.18.04.1~esm2","1.2-4ubuntu0.18.04.1~esm3","1.2-4ubuntu0.18.04.1~esm4","1.2-4ubuntu0.18.04.1~esm5"],"ecosystem_specific":{"binaries":[{"binary_name":"libxmltok1","binary_version":"1.2-4ubuntu0.18.04.1~esm6"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2026-24515","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-25210","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8023-1.json"}},{"package":{"name":"libxmltok","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libxmltok?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.20.04.1~esm6"}]}],"versions":["1.2-4","1.2-4ubuntu0.20.04.1~esm1","1.2-4ubuntu0.20.04.1~esm2","1.2-4ubuntu0.20.04.1~esm3","1.2-4ubuntu0.20.04.1~esm4","1.2-4ubuntu0.20.04.1~esm5"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.2-4ubuntu0.20.04.1~esm6","binary_name":"libxmltok1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8023-1.json","cves_map":{"cves":[{"id":"CVE-2026-24515","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-25210"}],"ecosystem":"Ubuntu:Pro:20.04:LTS"}}},{"package":{"name":"libxmltok","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libxmltok?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4ubuntu0.22.04.1~esm6"}]}],"versions":["1.2-4","1.2-4ubuntu0.22.04.1~esm1","1.2-4ubuntu0.22.04.1~esm2","1.2-4ubuntu0.22.04.1~esm3","1.2-4ubuntu0.22.04.1~esm4","1.2-4ubuntu0.22.04.1~esm5"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libxmltok1","binary_version":"1.2-4ubuntu0.22.04.1~esm6"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-24515"},{"id":"CVE-2026-25210","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8023-1.json"}},{"package":{"name":"libxmltok","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/libxmltok?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2-4.1ubuntu2.24.0.4.1+esm4"}]}],"versions":["1.2-4ubuntu1","1.2-4.1ubuntu1","1.2-4.1ubuntu2","1.2-4.1ubuntu2.24.0.4.1+esm1","1.2-4.1ubuntu2.24.0.4.1+esm2","1.2-4.1ubuntu2.24.0.4.1+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"libxmltok1t64","binary_version":"1.2-4.1ubuntu2.24.0.4.1+esm4"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8023-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-24515"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-25210"}],"ecosystem":"Ubuntu:Pro:24.04:LTS"}}}],"schema_version":"1.7.5"}