{"id":"USN-6591-1","summary":"postfix vulnerability","details":"Timo Longin discovered that Postfix incorrectly handled certain email line\nendings. A remote attacker could possibly use this issue to bypass an email\nauthentication mechanism, allowing domain spoofing and potential spamming.\n\nPlease note that certain configuration changes are required to address\nthis issue. They are not enabled by default for backward compatibility.\nInformation can be found at https://www.postfix.org/smtp-smuggling.html.\n","modified":"2026-06-29T13:51:00.528284715Z","published":"2024-01-22T12:35:30Z","related":["UBUNTU-CVE-2023-51764"],"upstream":["CVE-2023-51764","UBUNTU-CVE-2023-51764"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6591-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-51764"},{"type":"REPORT","url":"https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/2049337"}],"affected":[{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.0-1ubuntu1.2+esm2"}]}],"versions":["2.10.2-1","2.10.2-1build1","2.11.0-1","2.11.0-1ubuntu1","2.11.0-1ubuntu1.2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.11.0-1ubuntu1.2+esm2","binary_name":"postfix"},{"binary_name":"postfix-cdb","binary_version":"2.11.0-1ubuntu1.2+esm2"},{"binary_version":"2.11.0-1ubuntu1.2+esm2","binary_name":"postfix-ldap"},{"binary_version":"2.11.0-1ubuntu1.2+esm2","binary_name":"postfix-mysql"},{"binary_version":"2.11.0-1ubuntu1.2+esm2","binary_name":"postfix-pcre"},{"binary_version":"2.11.0-1ubuntu1.2+esm2","binary_name":"postfix-pgsql"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6591-1.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0-3ubuntu0.4+esm2"}]}],"versions":["2.11.3-1ubuntu2","2.11.3-1ubuntu3","3.0.4-1ubuntu1","3.0.4-2","3.0.4-3","3.0.4-5","3.0.4-5build1","3.1.0-3","3.1.0-3ubuntu0.1","3.1.0-3ubuntu0.2","3.1.0-3ubuntu0.3","3.1.0-3ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"3.1.0-3ubuntu0.4+esm2","binary_name":"postfix"},{"binary_version":"3.1.0-3ubuntu0.4+esm2","binary_name":"postfix-cdb"},{"binary_version":"3.1.0-3ubuntu0.4+esm2","binary_name":"postfix-ldap"},{"binary_name":"postfix-mysql","binary_version":"3.1.0-3ubuntu0.4+esm2"},{"binary_version":"3.1.0-3ubuntu0.4+esm2","binary_name":"postfix-pcre"},{"binary_name":"postfix-pgsql","binary_version":"3.1.0-3ubuntu0.4+esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6591-1.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.0-1ubuntu0.4+esm2"}]}],"versions":["3.2.3-1","3.2.3-1build1","3.2.4-1","3.2.5-1","3.2.5-1build1","3.3.0-1","3.3.0-1ubuntu0.1","3.3.0-1ubuntu0.2","3.3.0-1ubuntu0.3","3.3.0-1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.3.0-1ubuntu0.4+esm2"},{"binary_version":"3.3.0-1ubuntu0.4+esm2","binary_name":"postfix-cdb"},{"binary_version":"3.3.0-1ubuntu0.4+esm2","binary_name":"postfix-ldap"},{"binary_version":"3.3.0-1ubuntu0.4+esm2","binary_name":"postfix-lmdb"},{"binary_name":"postfix-mysql","binary_version":"3.3.0-1ubuntu0.4+esm2"},{"binary_name":"postfix-pcre","binary_version":"3.3.0-1ubuntu0.4+esm2"},{"binary_version":"3.3.0-1ubuntu0.4+esm2","binary_name":"postfix-pgsql"},{"binary_version":"3.3.0-1ubuntu0.4+esm2","binary_name":"postfix-sqlite"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6591-1.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.13-0ubuntu1.3"}]}],"versions":["3.4.5-1ubuntu1","3.4.7-1","3.4.7-2","3.4.8-1","3.4.9-1","3.4.10-1","3.4.10-1ubuntu1","3.4.13-0ubuntu1","3.4.13-0ubuntu1.1","3.4.13-0ubuntu1.2"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.4.13-0ubuntu1.3"},{"binary_name":"postfix-cdb","binary_version":"3.4.13-0ubuntu1.3"},{"binary_name":"postfix-ldap","binary_version":"3.4.13-0ubuntu1.3"},{"binary_name":"postfix-lmdb","binary_version":"3.4.13-0ubuntu1.3"},{"binary_name":"postfix-mysql","binary_version":"3.4.13-0ubuntu1.3"},{"binary_version":"3.4.13-0ubuntu1.3","binary_name":"postfix-pcre"},{"binary_name":"postfix-pgsql","binary_version":"3.4.13-0ubuntu1.3"},{"binary_name":"postfix-sqlite","binary_version":"3.4.13-0ubuntu1.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6591-1.json","cves_map":{"cves":[],"ecosystem":"Ubuntu:20.04:LTS"}}},{"package":{"name":"postfix","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1ubuntu1.2"}]}],"versions":["3.5.6-1ubuntu2","3.5.13-1ubuntu1","3.5.13-1ubuntu2","3.5.13-1ubuntu3","3.6.3-4ubuntu1","3.6.3-5ubuntu1","3.6.3-5ubuntu2","3.6.4-1ubuntu1","3.6.4-1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.6.4-1ubuntu1.2","binary_name":"postfix"},{"binary_name":"postfix-cdb","binary_version":"3.6.4-1ubuntu1.2"},{"binary_version":"3.6.4-1ubuntu1.2","binary_name":"postfix-ldap"},{"binary_name":"postfix-lmdb","binary_version":"3.6.4-1ubuntu1.2"},{"binary_name":"postfix-mysql","binary_version":"3.6.4-1ubuntu1.2"},{"binary_version":"3.6.4-1ubuntu1.2","binary_name":"postfix-pcre"},{"binary_name":"postfix-pgsql","binary_version":"3.6.4-1ubuntu1.2"},{"binary_name":"postfix-sqlite","binary_version":"3.6.4-1ubuntu1.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6591-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[]}}}],"schema_version":"1.7.5"}