{"id":"USN-7974-1","summary":"libxml2 vulnerabilities","details":"It was discovered that libxml2 incorrectly handled maliciously crafted SGML\ncatalog files. An attacker could possibly use this issue to cause libxml2\nto consume excessive resources, leading to a denial of service.\n(CVE-2025-8732)\n\nIt was discovered that libxml2 incorrectly handled recursive include\ndirectories with the RelaxNG parser. An attacker could possibly use this\nissue to cause libxml2 to consume excessive resources, leading to a denial\nof service. (CVE-2026-0989)\n\nNick Wellnhofer discovered that libxml2 incorrectly parsed catalogs with\nself-referencing URI delegates. An attacker could possibly use this issue\nto cause libxml2 to consume excessive resources, leading to a denial of\nservice. (CVE-2026-0990)\n\nNick Wellnhofer discovered that libxml2 inefficiently parsed catalogs\nlinked with repeating nextCatalog elements. An attacker could possibly use\nthis issue to cause libxml2 to use excessive resources, leading to a denial\nof service. (CVE-2026-0992)","modified":"2026-06-25T13:33:31.637692103Z","published":"2026-01-22T13:23:49Z","related":["UBUNTU-CVE-2025-8732","UBUNTU-CVE-2026-0989","UBUNTU-CVE-2026-0990","UBUNTU-CVE-2026-0992"],"upstream":["UBUNTU-CVE-2025-8732","UBUNTU-CVE-2026-0989","UBUNTU-CVE-2026-0990","UBUNTU-CVE-2026-0992"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7974-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-8732"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0989"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0990"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0992"}],"affected":[{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.1+dfsg1-3ubuntu4.13+esm11"}]}],"versions":["2.9.1+dfsg1-3ubuntu2","2.9.1+dfsg1-3ubuntu3","2.9.1+dfsg1-3ubuntu4","2.9.1+dfsg1-3ubuntu4.1","2.9.1+dfsg1-3ubuntu4.2","2.9.1+dfsg1-3ubuntu4.3","2.9.1+dfsg1-3ubuntu4.4","2.9.1+dfsg1-3ubuntu4.5","2.9.1+dfsg1-3ubuntu4.6","2.9.1+dfsg1-3ubuntu4.7","2.9.1+dfsg1-3ubuntu4.8","2.9.1+dfsg1-3ubuntu4.9","2.9.1+dfsg1-3ubuntu4.10","2.9.1+dfsg1-3ubuntu4.11","2.9.1+dfsg1-3ubuntu4.12","2.9.1+dfsg1-3ubuntu4.13","2.9.1+dfsg1-3ubuntu4.13+esm1","2.9.1+dfsg1-3ubuntu4.13+esm2","2.9.1+dfsg1-3ubuntu4.13+esm3","2.9.1+dfsg1-3ubuntu4.13+esm4","2.9.1+dfsg1-3ubuntu4.13+esm5","2.9.1+dfsg1-3ubuntu4.13+esm6","2.9.1+dfsg1-3ubuntu4.13+esm7","2.9.1+dfsg1-3ubuntu4.13+esm8","2.9.1+dfsg1-3ubuntu4.13+esm9","2.9.1+dfsg1-3ubuntu4.13+esm10"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm11","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm11"},{"binary_name":"python-libxml2","binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm11"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2025-8732","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2026-0989","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-0990"},{"id":"CVE-2026-0992","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":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7974-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.3+dfsg1-1ubuntu0.7+esm12"}]}],"versions":["2.9.2+zdfsg1-4","2.9.2+zdfsg1-4ubuntu1","2.9.2+zdfsg1-4ubuntu2","2.9.2+zdfsg1-4ubuntu3","2.9.3+dfsg1-1","2.9.3+dfsg1-1ubuntu0.1","2.9.3+dfsg1-1ubuntu0.2","2.9.3+dfsg1-1ubuntu0.3","2.9.3+dfsg1-1ubuntu0.4","2.9.3+dfsg1-1ubuntu0.5","2.9.3+dfsg1-1ubuntu0.6","2.9.3+dfsg1-1ubuntu0.7","2.9.3+dfsg1-1ubuntu0.7+esm1","2.9.3+dfsg1-1ubuntu0.7+esm2","2.9.3+dfsg1-1ubuntu0.7+esm3","2.9.3+dfsg1-1ubuntu0.7+esm4","2.9.3+dfsg1-1ubuntu0.7+esm5","2.9.3+dfsg1-1ubuntu0.7+esm6","2.9.3+dfsg1-1ubuntu0.7+esm7","2.9.3+dfsg1-1ubuntu0.7+esm8","2.9.3+dfsg1-1ubuntu0.7+esm9","2.9.3+dfsg1-1ubuntu0.7+esm10","2.9.3+dfsg1-1ubuntu0.7+esm11"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm12","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm12"},{"binary_name":"python-libxml2","binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm12"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","type":"CVSS_V4"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2025-8732"},{"id":"CVE-2026-0989","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-0990"},{"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":"Ubuntu","score":"medium"}],"id":"CVE-2026-0992"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7974-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.4+dfsg1-6.1ubuntu1.9+esm7"}]}],"versions":["2.9.4+dfsg1-4ubuntu1","2.9.4+dfsg1-5ubuntu1","2.9.4+dfsg1-5ubuntu2","2.9.4+dfsg1-5.1ubuntu1","2.9.4+dfsg1-5.2ubuntu1","2.9.4+dfsg1-6.1ubuntu1","2.9.4+dfsg1-6.1ubuntu1.2","2.9.4+dfsg1-6.1ubuntu1.3","2.9.4+dfsg1-6.1ubuntu1.4","2.9.4+dfsg1-6.1ubuntu1.5","2.9.4+dfsg1-6.1ubuntu1.6","2.9.4+dfsg1-6.1ubuntu1.7","2.9.4+dfsg1-6.1ubuntu1.8","2.9.4+dfsg1-6.1ubuntu1.9","2.9.4+dfsg1-6.1ubuntu1.9+esm1","2.9.4+dfsg1-6.1ubuntu1.9+esm2","2.9.4+dfsg1-6.1ubuntu1.9+esm3","2.9.4+dfsg1-6.1ubuntu1.9+esm4","2.9.4+dfsg1-6.1ubuntu1.9+esm5","2.9.4+dfsg1-6.1ubuntu1.9+esm6"],"ecosystem_specific":{"binaries":[{"binary_name":"libxml2","binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm7"},{"binary_name":"libxml2-utils","binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm7"},{"binary_name":"python-libxml2","binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm7"},{"binary_name":"python3-libxml2","binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm7"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2025-8732"},{"id":"CVE-2026-0989","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-0990","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"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":"Ubuntu","score":"medium"}],"id":"CVE-2026-0992"}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7974-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.10+dfsg-5ubuntu0.20.04.10+esm4"}]}],"versions":["2.9.4+dfsg1-7ubuntu3","2.9.4+dfsg1-7ubuntu5","2.9.4+dfsg1-8ubuntu1","2.9.4+dfsg1-8ubuntu2","2.9.4+dfsg1-8ubuntu3","2.9.10+dfsg-1ubuntu3","2.9.10+dfsg-4build1","2.9.10+dfsg-5","2.9.10+dfsg-5ubuntu0.20.04.1","2.9.10+dfsg-5ubuntu0.20.04.2","2.9.10+dfsg-5ubuntu0.20.04.3","2.9.10+dfsg-5ubuntu0.20.04.4","2.9.10+dfsg-5ubuntu0.20.04.5","2.9.10+dfsg-5ubuntu0.20.04.6","2.9.10+dfsg-5ubuntu0.20.04.7","2.9.10+dfsg-5ubuntu0.20.04.8","2.9.10+dfsg-5ubuntu0.20.04.9","2.9.10+dfsg-5ubuntu0.20.04.10","2.9.10+dfsg-5ubuntu0.20.04.10+esm1","2.9.10+dfsg-5ubuntu0.20.04.10+esm2","2.9.10+dfsg-5ubuntu0.20.04.10+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"libxml2","binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm4"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm4","binary_name":"libxml2-utils"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm4","binary_name":"python-libxml2"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm4","binary_name":"python3-libxml2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2025-8732","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"},{"type":"Ubuntu","score":"low"}]},{"id":"CVE-2026-0989","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-0990","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-0992","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":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7974-1.json"}},{"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-1ubuntu0.11"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"2.9.13+dfsg-1ubuntu0.11","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.13+dfsg-1ubuntu0.11"},{"binary_version":"2.9.13+dfsg-1ubuntu0.11","binary_name":"python3-libxml2"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2025-8732"},{"id":"CVE-2026-0989","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-0990"},{"id":"CVE-2026-0992","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7974-1.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-1.3ubuntu3.7"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_name":"libxml2","binary_version":"2.9.14+dfsg-1.3ubuntu3.7"},{"binary_name":"libxml2-utils","binary_version":"2.9.14+dfsg-1.3ubuntu3.7"},{"binary_name":"python3-libxml2","binary_version":"2.9.14+dfsg-1.3ubuntu3.7"}],"availability":"No 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