{"id":"UBUNTU-CVE-2016-6263","details":"The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via crafted UTF-8 data.","modified":"2026-04-22T11:28:24.025001Z","published":"2016-07-21T00:00:00Z","related":["USN-3068-1"],"upstream":["CVE-2016-6263"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-6263"},{"type":"REPORT","url":"https://lists.gnu.org/archive/html/help-libidn/2016-07/msg00009.html"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2016/07/20/6"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3068-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-6263"}],"affected":[{"package":{"name":"libidn","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/libidn@1.28-1ubuntu2.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.28-1ubuntu2.1"}]}],"versions":["1.28-1ubuntu1","1.28-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.28-1ubuntu2.1","binary_name":"idn"},{"binary_version":"1.28-1ubuntu2.1","binary_name":"libidn11"},{"binary_version":"1.28-1ubuntu2.1","binary_name":"libidn11-java"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-6263.json"}},{"package":{"name":"libidn","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libidn@1.32-3ubuntu1.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.32-3ubuntu1.1"}]}],"versions":["1.28-1ubuntu2","1.32-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.32-3ubuntu1.1","binary_name":"idn"},{"binary_version":"1.32-3ubuntu1.1","binary_name":"libidn11"},{"binary_version":"1.32-3ubuntu1.1","binary_name":"libidn11-java"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-6263.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}