{"id":"UBUNTU-CVE-2026-43964","details":"Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.","modified":"2026-06-30T18:18:11.614871612Z","published":"2026-05-05T00:00:00Z","related":["USN-8253-1","USN-8253-2"],"upstream":["CVE-2026-43964"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-43964"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-43964"},{"type":"REPORT","url":"https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/05/04/25"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8253-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8253-2"}],"affected":[{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.0-1ubuntu1.2+esm4"}]}],"versions":["2.10.2-1","2.10.2-1build1","2.11.0-1","2.11.0-1ubuntu1","2.11.0-1ubuntu1.2","2.11.0-1ubuntu1.2+esm2","2.11.0-1ubuntu1.2+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"2.11.0-1ubuntu1.2+esm4"},{"binary_version":"2.11.0-1ubuntu1.2+esm4","binary_name":"postfix-cdb"},{"binary_name":"postfix-ldap","binary_version":"2.11.0-1ubuntu1.2+esm4"},{"binary_version":"2.11.0-1ubuntu1.2+esm4","binary_name":"postfix-mysql"},{"binary_name":"postfix-pcre","binary_version":"2.11.0-1ubuntu1.2+esm4"},{"binary_name":"postfix-pgsql","binary_version":"2.11.0-1ubuntu1.2+esm4"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.0-3ubuntu0.4+esm4"}]}],"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","3.1.0-3ubuntu0.4+esm2","3.1.0-3ubuntu0.4+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: 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with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.13-0ubuntu1.4+esm1"}]}],"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","3.4.13-0ubuntu1.3","3.4.13-0ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-cdb","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-ldap","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-lmdb","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-mysql","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-pcre","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_name":"postfix-pgsql","binary_version":"3.4.13-0ubuntu1.4+esm1"},{"binary_version":"3.4.13-0ubuntu1.4+esm1","binary_name":"postfix-sqlite"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.4-1ubuntu1.4"}]}],"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","3.6.4-1ubuntu1.2","3.6.4-1ubuntu1.3"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.6.4-1ubuntu1.4"},{"binary_version":"3.6.4-1ubuntu1.4","binary_name":"postfix-cdb"},{"binary_name":"postfix-ldap","binary_version":"3.6.4-1ubuntu1.4"},{"binary_name":"postfix-lmdb","binary_version":"3.6.4-1ubuntu1.4"},{"binary_version":"3.6.4-1ubuntu1.4","binary_name":"postfix-mysql"},{"binary_name":"postfix-pcre","binary_version":"3.6.4-1ubuntu1.4"},{"binary_name":"postfix-pgsql","binary_version":"3.6.4-1ubuntu1.4"},{"binary_name":"postfix-sqlite","binary_version":"3.6.4-1ubuntu1.4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.6-1ubuntu0.1"}]}],"versions":["3.8.1-2","3.8.2-1","3.8.3-1","3.8.4-1","3.8.5-1","3.8.6-1","3.8.6-1build1","3.8.6-1build2"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.8.6-1ubuntu0.1"},{"binary_version":"3.8.6-1ubuntu0.1","binary_name":"postfix-cdb"},{"binary_version":"3.8.6-1ubuntu0.1","binary_name":"postfix-ldap"},{"binary_version":"3.8.6-1ubuntu0.1","binary_name":"postfix-lmdb"},{"binary_name":"postfix-mysql","binary_version":"3.8.6-1ubuntu0.1"},{"binary_name":"postfix-pcre","binary_version":"3.8.6-1ubuntu0.1"},{"binary_name":"postfix-pgsql","binary_version":"3.8.6-1ubuntu0.1"},{"binary_name":"postfix-sqlite","binary_version":"3.8.6-1ubuntu0.1"}],"availability":"No 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required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43964.json"}},{"package":{"name":"postfix","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/postfix?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.6-4ubuntu2.1"}]}],"versions":["3.10.2-1ubuntu2","3.10.2-1ubuntu3","3.10.6-1ubuntu1","3.10.6-4ubuntu1","3.10.6-4ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"postfix","binary_version":"3.10.6-4ubuntu2.1"},{"binary_name":"postfix-cdb","binary_version":"3.10.6-4ubuntu2.1"},{"binary_name":"postfix-ldap","binary_version":"3.10.6-4ubuntu2.1"},{"binary_version":"3.10.6-4ubuntu2.1","binary_name":"postfix-lmdb"},{"binary_name":"postfix-mongodb","binary_version":"3.10.6-4ubuntu2.1"},{"binary_name":"postfix-mysql","binary_version":"3.10.6-4ubuntu2.1"},{"binary_name":"postfix-pcre","binary_version":"3.10.6-4ubuntu2.1"},{"binary_name":"postfix-pgsql","binary_version":"3.10.6-4ubuntu2.1"},{"binary_version":"3.10.6-4ubuntu2.1","binary_name":"postfix-sqlite"}],"availability":"No 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