{"id":"UBUNTU-CVE-2016-4556","details":"Double free vulnerability in Esi.cc in Squid 3.x before 3.5.18 and 4.x before 4.0.10 allows remote servers to cause a denial of service (crash) via a crafted Edge Side Includes (ESI) response.","modified":"2026-02-04T04:07:53.365880Z","published":"2016-05-10T00:00:00Z","related":["USN-2995-1"],"upstream":["CVE-2016-4556"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4556"},{"type":"REPORT","url":"http://www.squid-cache.org/Advisories/SQUID-2016_9.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2995-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-4556"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.3.8-1ubuntu6.8?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.8-1ubuntu6.8"}]}],"versions":["3.3.8-1ubuntu3","3.3.8-1ubuntu4","3.3.8-1ubuntu5","3.3.8-1ubuntu6","3.3.8-1ubuntu6.1","3.3.8-1ubuntu6.2","3.3.8-1ubuntu6.3","3.3.8-1ubuntu6.4","3.3.8-1ubuntu6.6"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.3.8-1ubuntu6.8"},{"binary_name":"squid-cgi","binary_version":"3.3.8-1ubuntu6.8"},{"binary_name":"squid-purge","binary_version":"3.3.8-1ubuntu6.8"},{"binary_name":"squid3","binary_version":"3.3.8-1ubuntu6.8"},{"binary_name":"squid3-common","binary_version":"3.3.8-1ubuntu6.8"},{"binary_name":"squidclient","binary_version":"3.3.8-1ubuntu6.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-4556.json"}},{"package":{"name":"squid3","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.12-1ubuntu7.2"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17","3.5.12-1ubuntu6","3.5.12-1ubuntu7","3.5.12-1ubuntu7.1"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.12-1ubuntu7.2"},{"binary_name":"squid-cgi","binary_version":"3.5.12-1ubuntu7.2"},{"binary_name":"squid-common","binary_version":"3.5.12-1ubuntu7.2"},{"binary_name":"squid-purge","binary_version":"3.5.12-1ubuntu7.2"},{"binary_name":"squid3","binary_version":"3.5.12-1ubuntu7.2"},{"binary_name":"squidclient","binary_version":"3.5.12-1ubuntu7.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-4556.json"}}],"schema_version":"1.7.3","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"}]}