{"id":"USN-8910-1","summary":"libxml2 vulnerabilities","details":"Yirou Yang discovered that libxml2 incorrectly handled certain XML\ncatalogs. If a user or automated system was tricked into processing a\nspecially crafted XML catalog, an attacker could possibly use this issue to\ncause libxml2 to crash, resulting in a denial of service. (CVE-2026-76781)\n\nIt was discovered that libxml2 incorrectly handled certain large qualified\nnames, leading to a heap-based buffer overflow. An attacker could possibly\nuse this issue to cause libxml2 to crash, resulting in a denial of service,\nor possibly execute arbitrary code. (CVE-2026-86138)\n\nIt was discovered that libxml2 incorrectly handled escaping certain large\nURI strings. An attacker could possibly use this issue to cause libxml2 to\nuse excessive resources, leading to a denial of service. This issue only\naffected Ubuntu 26.04 LTS. (CVE-2026-86139)\n\nXudong Cao and Meng Xu discovered that libxml2 incorrectly handled certain\nlarge XPointer expressions, leading to a heap-based buffer overflow. An\nattacker could possibly use this issue to cause libxml2 to crash, resulting\nin a denial of service, or possibly execute arbitrary code.\n(CVE-2026-86142)\n\nXudong Cao and Meng Xu discovered that libxml2 did not check for integer\noverflows before passing output lengths to write callbacks. An attacker\ncould possibly use this issue to cause an application using libxml2 to\ncrash, resulting in a denial of service. (CVE-2026-86143)\n\nIt was discovered that libxml2 did not apply parser options, such as\ndisabling network access, when processing XInclude directives under certain\ncircumstances. An attacker could possibly use this issue to perform XML\nexternal entity injection or server-side request forgery attacks, or cause\na denial of service. (CVE-2026-86144)","modified":"2026-10-09T07:57:36.005248021Z","published":"2026-10-08T20:05:15Z","related":["UBUNTU-CVE-2026-76781","UBUNTU-CVE-2026-86138","UBUNTU-CVE-2026-86139","UBUNTU-CVE-2026-86142","UBUNTU-CVE-2026-86143","UBUNTU-CVE-2026-86144"],"upstream":["CVE-2026-76781","CVE-2026-86138","CVE-2026-86139","CVE-2026-86142","CVE-2026-86143","CVE-2026-86144","UBUNTU-CVE-2026-76781","UBUNTU-CVE-2026-86138","UBUNTU-CVE-2026-86139","UBUNTU-CVE-2026-86142","UBUNTU-CVE-2026-86143","UBUNTU-CVE-2026-86144"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8910-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-76781"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-86138"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-86139"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-86142"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-86143"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-86144"}],"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+esm13"}]}],"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","2.9.1+dfsg1-3ubuntu4.13+esm11","2.9.1+dfsg1-3ubuntu4.13+esm12"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm13","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm13"},{"binary_version":"2.9.1+dfsg1-3ubuntu4.13+esm13","binary_name":"python-libxml2"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-76781"},{"id":"CVE-2026-86138","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"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-2026-86142"},{"id":"CVE-2026-86143","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L","type":"CVSS_V3"},{"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-2026-86144"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8910-1.json"}},{"package":{"name":"libxml2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.3+dfsg1-1ubuntu0.7+esm14"}]}],"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","2.9.3+dfsg1-1ubuntu0.7+esm12","2.9.3+dfsg1-1ubuntu0.7+esm13"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm14","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm14"},{"binary_name":"python-libxml2","binary_version":"2.9.3+dfsg1-1ubuntu0.7+esm14"}],"availability":"Available 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with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-76781"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"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-2026-86138"},{"id":"CVE-2026-86142","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-2026-86143","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-86144","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/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:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8910-1.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+esm6"}]}],"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","2.9.10+dfsg-5ubuntu0.20.04.10+esm4","2.9.10+dfsg-5ubuntu0.20.04.10+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm6","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm6"},{"binary_name":"python-libxml2","binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm6"},{"binary_version":"2.9.10+dfsg-5ubuntu0.20.04.10+esm6","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":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-76781"},{"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-2026-86138"},{"id":"CVE-2026-86142","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"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-2026-86143","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:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L"},{"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-2026-86144"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8910-1.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-1ubuntu0.14"}]}],"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","2.9.13+dfsg-1ubuntu0.12","2.9.13+dfsg-1ubuntu0.13"],"ecosystem_specific":{"binaries":[{"binary_version":"2.9.13+dfsg-1ubuntu0.14","binary_name":"libxml2"},{"binary_name":"libxml2-utils","binary_version":"2.9.13+dfsg-1ubuntu0.14"},{"binary_version":"2.9.13+dfsg-1ubuntu0.14","binary_name":"python3-libxml2"}],"availability":"No subscription 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