{"id":"UBUNTU-CVE-2016-9909","details":"The serializer in html5lib before 0.99999999 might allow remote attackers to conduct cross-site scripting (XSS) attacks by leveraging mishandling of the \u003c (less than) character in attribute values.","modified":"2025-10-24T04:45:59Z","published":"2017-02-22T16:59:00Z","upstream":["CVE-2016-9909"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-9909"},{"type":"REPORT","url":"https://www.sourceclear.com/registry/security/cross-site-scripting-xss-/python/sid-3068"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2016/12/06/5"},{"type":"REPORT","url":"https://github.com/html5lib/html5lib-python/issues/11"},{"type":"REPORT","url":"https://github.com/html5lib/html5lib-python/issues/12"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-9909"}],"affected":[{"package":{"name":"html5lib","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/html5lib@0.999-4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.999-3build1","0.999-4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.999-4","binary_name":"python-html5lib"},{"binary_version":"0.999-4","binary_name":"python3-html5lib"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-9909.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"low"}]}