{"id":"UBUNTU-CVE-2023-5824","details":"A flaw was found in Squid. The limits applied for validation of HTTP response headers are applied before caching. However, Squid may grow a cached HTTP response header beyond the configured maximum size, causing a stall or crash of the worker process when a large header is retrieved from the disk cache, resulting in a denial of service.","modified":"2026-02-04T03:17:47.876361Z","published":"2023-11-03T08:15:00Z","related":["USN-6728-1","USN-6728-2","USN-6728-3"],"upstream":["CVE-2023-5824"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-5824"},{"type":"REPORT","url":"https://github.com/squid-cache/squid/security/advisories/GHSA-543m-w2m2-g255"},{"type":"REPORT","url":"https://lists.squid-cache.org/pipermail/squid-announce/2023-October/000155.html"},{"type":"REPORT","url":"https://megamansec.github.io/Squid-Security-Audit/cache-headers.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6728-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6728-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-5824"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6728-3"}],"affected":[{"package":{"name":"squid3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm6?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","3.5.12-1ubuntu7.12","3.5.12-1ubuntu7.13","3.5.12-1ubuntu7.14","3.5.12-1ubuntu7.15","3.5.12-1ubuntu7.16","3.5.12-1ubuntu7.16+esm1","3.5.12-1ubuntu7.16+esm2","3.5.12-1ubuntu7.16+esm3","3.5.12-1ubuntu7.16+esm4","3.5.12-1ubuntu7.16+esm5","3.5.12-1ubuntu7.16+esm6"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-cgi","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-common","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid-purge","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squid3","binary_version":"3.5.12-1ubuntu7.16+esm6"},{"binary_name":"squidclient","binary_version":"3.5.12-1ubuntu7.16+esm6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5824.json"}},{"package":{"name":"squid3","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.14+esm5?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","3.5.27-1ubuntu1.7","3.5.27-1ubuntu1.8","3.5.27-1ubuntu1.9","3.5.27-1ubuntu1.10","3.5.27-1ubuntu1.11","3.5.27-1ubuntu1.12","3.5.27-1ubuntu1.13","3.5.27-1ubuntu1.14","3.5.27-1ubuntu1.14+esm1","3.5.27-1ubuntu1.14+esm2","3.5.27-1ubuntu1.14+esm3","3.5.27-1ubuntu1.14+esm4","3.5.27-1ubuntu1.14+esm5"],"ecosystem_specific":{"binaries":[{"binary_name":"squid","binary_version":"3.5.27-1ubuntu1.14+esm5"},{"binary_name":"squid-cgi","binary_version":"3.5.27-1ubuntu1.14+esm5"},{"binary_name":"squid-common","binary_version":"3.5.27-1ubuntu1.14+esm5"},{"binary_name":"squid-purge","binary_version":"3.5.27-1ubuntu1.14+esm5"},{"binary_name":"squid3","binary_version":"3.5.27-1ubuntu1.14+esm5"},{"binary_name":"squidclient","binary_version":"3.5.27-1ubuntu1.14+esm5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5824.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/squid@4.10-1ubuntu1.12?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.10-1ubuntu1.12"}]}],"versions":["4.8-1ubuntu2","4.8-1ubuntu3","4.9-2ubuntu1","4.9-2ubuntu2","4.9-2ubuntu3","4.9-2ubuntu4","4.10-1ubuntu1","4.10-1ubuntu1.1","4.10-1ubuntu1.2","4.10-1ubuntu1.3","4.10-1ubuntu1.4","4.10-1ubuntu1.5","4.10-1ubuntu1.6","4.10-1ubuntu1.7","4.10-1ubuntu1.8","4.10-1ubuntu1.9","4.10-1ubuntu1.10","4.10-1ubuntu1.11"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"squid","binary_version":"4.10-1ubuntu1.12"},{"binary_name":"squid-cgi","binary_version":"4.10-1ubuntu1.12"},{"binary_name":"squid-common","binary_version":"4.10-1ubuntu1.12"},{"binary_name":"squid-purge","binary_version":"4.10-1ubuntu1.12"},{"binary_name":"squidclient","binary_version":"4.10-1ubuntu1.12"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-5824.json"}},{"package":{"name":"squid","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/squid@5.7-0ubuntu0.22.04.4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.7-0ubuntu0.22.04.4"}]}],"versions":["4.13-10ubuntu5","5.2-1ubuntu1","5.2-1ubuntu3","5.2-1ubuntu4","5.2-1ubuntu4.1","5.2-1ubuntu4.2","5.2-1ubuntu4.3","5.7-0ubuntu0.22.04.1","5.7-0ubuntu0.22.04.2","5.7-0ubuntu0.22.04.3"],"ecosystem_specific":{"availability":"No subscription 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