{"id":"UBUNTU-CVE-2026-123202","details":"libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.","modified":"2026-11-07T01:46:30.109339726Z","published":"2026-11-06T00:00:00Z","upstream":["CVE-2026-123202"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-123202"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-123202"},{"type":"REPORT","url":"https://github.com/bakulf/libnxml/blob/9272d1cd6fee88fe7fd4fd812736d95a6ba25f2f/src/nxml_parser.c#L952-L958"},{"type":"REPORT","url":"https://github.com/bakulf/libnxml/commit/fbac242374883edf2ec14127ca6d2accf4704b6a"},{"type":"REPORT","url":"https://github.com/bakulf/libnxml/releases/tag/0.18.6"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libnxml-before-0.18.6-stack-based-buffer-overflow-via-long-multi-byte-xml-name"}],"affected":[{"package":{"name":"libnxml","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-6"],"ecosystem_specific":{"binaries":[{"binary_name":"libnxml0","binary_version":"0.18.3-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-6"],"ecosystem_specific":{"binaries":[{"binary_version":"0.18.3-6","binary_name":"libnxml0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-7","0.18.3-8"],"ecosystem_specific":{"binaries":[{"binary_version":"0.18.3-8","binary_name":"libnxml0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.3-8","0.18.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnxml0","binary_version":"0.18.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.4-1","0.18.4-2","0.18.5-1build1","0.18.5-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"libnxml0t64","binary_version":"0.18.5-1build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libnxml0t64","binary_version":"0.18.5-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}},{"package":{"name":"libnxml","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libnxml?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.5-1build2","0.18.5-2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.18.5-2","binary_name":"libnxml0t64"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123202.json"}}],"schema_version":"1.9.2","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":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}