{"id":"USN-7694-1","summary":"libxml2 vulnerabilities","details":"Ahmed Lekssays discovered that libxml2 did not properly perform certain\nmathematical operations, leading to an integer overflow. An attacker\ncould possibly use this issue to cause a crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2025-6021)\n\nAhmed Lekssays discovered that libxml2 did not properly validate the size\nof an untrusted input stream. An attacker could possibly use this issue\nto cause a crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2025-6170)\n\nNikita Sveshnikov discovered that libxml2 did not properly handle certain\nXPath expressions, leading to a use-after-free vulnerability. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49794)\n\nNikita Sveshnikov discovered that libxml2 contained a type confusion\nvulnerability when parsing specially crafted XML documents. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49796)","modified":"2026-02-10T04:49:42Z","published":"2025-08-14T04:48:16Z","related":["UBUNTU-CVE-2025-49794","UBUNTU-CVE-2025-49796","UBUNTU-CVE-2025-6021","UBUNTU-CVE-2025-6170"],"upstream":["CVE-2025-49794","CVE-2025-49796","CVE-2025-6021","CVE-2025-6170","UBUNTU-CVE-2025-49794","UBUNTU-CVE-2025-49796","UBUNTU-CVE-2025-6021","UBUNTU-CVE-2025-6170"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7694-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-6021"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-6170"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-49794"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-49796"}],"affected":[{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.1+dfsg1-3ubuntu4.13+esm8?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.1+dfsg1-3ubuntu4.13+esm8"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm8","binary_name":"libxml2"},{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm8","binary_name":"libxml2-dev"},{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm8","binary_name":"libxml2-utils"},{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm8","binary_name":"python-libxml2"}],"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-2025-6021","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-6170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49794","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49796","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7694-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.3+dfsg1-1ubuntu0.7+esm9?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.3+dfsg1-1ubuntu0.7+esm9"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm9","binary_name":"libxml2"},{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm9","binary_name":"libxml2-dev"},{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm9","binary_name":"libxml2-utils"},{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm9","binary_name":"python-libxml2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2025-6021","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-6170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49794","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49796","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7694-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.4+dfsg1-6.1ubuntu1.9+esm4?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.4+dfsg1-6.1ubuntu1.9+esm4"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm4","binary_name":"libxml2"},{"binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm4","binary_name":"libxml2-dev"},{"binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm4","binary_name":"libxml2-utils"},{"binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm4","binary_name":"python-libxml2"},{"binary_version":"2.9.4+dfsg1-6.1ubuntu1.9+esm4","binary_name":"python3-libxml2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2025-6021","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-6170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49794","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49796","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7694-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.10+dfsg-5ubuntu0.20.04.10+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1","binary_name":"libxml2"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1","binary_name":"libxml2-dev"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1","binary_name":"libxml2-utils"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1","binary_name":"python-libxml2"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm1","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-2025-6021","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-6170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49794","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49796","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7694-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.13+dfsg-1ubuntu0.8?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.13+dfsg-1ubuntu0.8"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.13+dfsg-1ubuntu0.8","binary_name":"libxml2"},{"binary_version":"2.9.13+dfsg-1ubuntu0.8","binary_name":"libxml2-dev"},{"binary_version":"2.9.13+dfsg-1ubuntu0.8","binary_name":"libxml2-utils"},{"binary_version":"2.9.13+dfsg-1ubuntu0.8","binary_name":"python3-libxml2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2025-6021","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-6170","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49794","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-49796","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7694-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libxml2@2.9.14+dfsg-1.3ubuntu3.4?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.14+dfsg-1.3ubuntu3.4"}]}],"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"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.14+dfsg-1.3ubuntu3.4","binary_name":"libxml2"},{"binary_version":"2.9.14+dfsg-1.3ubuntu3.4","binary_name":"libxml2-dev"},{"binary_version":"2.9.14+dfsg-1.3ubuntu3.4","binary_name":"libxml2-utils"},{"binary_version":"2.9.14+dfsg-1.3ubuntu3.4","binary_name":"python3-libxml2"}],"availability":"No 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