{"id":"UBUNTU-CVE-2019-18676","details":"An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.","modified":"2026-02-04T03:33:32.728794Z","published":"2019-11-26T17:15:00Z","related":["USN-4213-1","USN-4446-1"],"upstream":["CVE-2019-18676"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-18676"},{"type":"REPORT","url":"http://www.squid-cache.org/Advisories/SQUID-2019_8.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4213-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4446-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-18676"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.12?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.12-1ubuntu7.12"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17","3.5.12-1ubuntu6","3.5.12-1ubuntu7","3.5.12-1ubuntu7.1","3.5.12-1ubuntu7.2","3.5.12-1ubuntu7.3","3.5.12-1ubuntu7.4","3.5.12-1ubuntu7.5","3.5.12-1ubuntu7.6","3.5.12-1ubuntu7.7","3.5.12-1ubuntu7.8","3.5.12-1ubuntu7.9","3.5.12-1ubuntu7.10","3.5.12-1ubuntu7.11"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squid"},{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squid-cgi"},{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squid-common"},{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squid-purge"},{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squid3"},{"binary_version":"3.5.12-1ubuntu7.12","binary_name":"squidclient"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18676.json"}},{"package":{"name":"squid3","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.7?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.27-1ubuntu1.7"}]}],"versions":["3.5.23-5ubuntu1","3.5.23-5ubuntu2","3.5.27-1ubuntu1","3.5.27-1ubuntu1.1","3.5.27-1ubuntu1.2","3.5.27-1ubuntu1.3","3.5.27-1ubuntu1.4","3.5.27-1ubuntu1.5","3.5.27-1ubuntu1.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squid"},{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squid-cgi"},{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squid-common"},{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squid-purge"},{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squid3"},{"binary_version":"3.5.27-1ubuntu1.7","binary_name":"squidclient"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18676.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/squid@4.9-2ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9-2ubuntu1"}]}],"versions":["4.8-1ubuntu2","4.8-1ubuntu3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"4.9-2ubuntu1","binary_name":"squid"},{"binary_version":"4.9-2ubuntu1","binary_name":"squid-cgi"},{"binary_version":"4.9-2ubuntu1","binary_name":"squid-common"},{"binary_version":"4.9-2ubuntu1","binary_name":"squid-purge"},{"binary_version":"4.9-2ubuntu1","binary_name":"squid3"},{"binary_version":"4.9-2ubuntu1","binary_name":"squidclient"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18676.json"}}],"schema_version":"1.7.3","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":"Ubuntu","score":"medium"}]}