{"id":"UBUNTU-CVE-2018-14600","details":"An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.","modified":"2026-04-22T12:53:01.634952Z","published":"2018-08-24T00:00:00Z","related":["USN-3758-1","USN-3758-2"],"upstream":["CVE-2018-14600"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-14600"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3758-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3758-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-14600"}],"affected":[{"package":{"name":"libx11","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.2-1ubuntu2.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.2-1ubuntu2.1"}]}],"versions":["2:1.6.1-1ubuntu1","2:1.6.1-1ubuntu2","2:1.6.2-1ubuntu1","2:1.6.2-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.2-1ubuntu2.1","binary_name":"libx11-6"},{"binary_version":"2:1.6.2-1ubuntu2.1","binary_name":"libx11-data"},{"binary_version":"2:1.6.2-1ubuntu2.1","binary_name":"libx11-xcb1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-14600.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.3-1ubuntu2.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.3-1ubuntu2.1"}]}],"versions":["2:1.6.3-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.3-1ubuntu2.1","binary_name":"libx11-6"},{"binary_version":"2:1.6.3-1ubuntu2.1","binary_name":"libx11-data"},{"binary_version":"2:1.6.3-1ubuntu2.1","binary_name":"libx11-xcb1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-14600.json"}},{"package":{"name":"libx11","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libx11@2:1.6.4-3ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.6.4-3ubuntu0.1"}]}],"versions":["2:1.6.4-3"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.6.4-3ubuntu0.1","binary_name":"libx11-6"},{"binary_version":"2:1.6.4-3ubuntu0.1","binary_name":"libx11-data"},{"binary_version":"2:1.6.4-3ubuntu0.1","binary_name":"libx11-xcb1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-14600.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:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}