{"id":"UBUNTU-CVE-2026-24031","details":"Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.","modified":"2026-05-04T10:46:11.733540Z","published":"2026-03-27T00:00:00Z","related":["USN-8136-1"],"upstream":["CVE-2026-24031"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-24031"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-24031"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8136-1"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/dovecot@1:2.4.1+dfsg1-5ubuntu4.1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.4.1+dfsg1-5ubuntu4.1"}]}],"versions":["1:2.3.21.1+dfsg1-1ubuntu2","1:2.4.1+dfsg1-5ubuntu1","1:2.4.1+dfsg1-5ubuntu3","1:2.4.1+dfsg1-5ubuntu4"],"ecosystem_specific":{"binaries":[{"binary_name":"dovecot-auth-lua","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-core","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-flatcurve","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-gssapi","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-imapd","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-ldap","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-lmtpd","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-managesieved","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-mysql","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-pgsql","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-pop3d","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-sieve","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-solr","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-sqlite","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"},{"binary_name":"dovecot-submissiond","binary_version":"1:2.4.1+dfsg1-5ubuntu4.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24031.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}