CVE-2026-24031
Fixed in a distro release EPSS <1%CVSS 7.7
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.
Products: Open-Xchange GmbH OX Dovecot Pro, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.23 | dovecot | 2.4.3-r0 |
| Alpine 3.24 | dovecot | 2.4.3-r0 |
| Debian 13 | dovecot | 1:2.4.1+dfsg1-6+deb13u4 |
| Debian 14 | dovecot | 1:2.4.3+dfsg1-1 |
| SUSE Linux Enterprise Server 16.0 | dovecot24 | 2.4.3-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | dovecot24 | 2.4.3-160000.1.1 |
| Ubuntu 22.04 LTS | dovecot | 1:2.3.16+dfsg1-3ubuntu2.7 |
| Ubuntu 24.04 LTS | dovecot | 1:2.3.21+dfsg1-2ubuntu6.3 |
| Ubuntu 25.10 | dovecot | 1:2.4.1+dfsg1-5ubuntu4.1 |
| openSUSE Leap 16.0 | dovecot24 | 2.4.3-160000.1.1 |
| openSUSE Tumbleweed | dovecot24 | 2.4.3-1.1 |