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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade dovecot | Mar 30, 2026 | Mar 27, 2026 |
| Debian | — | Upgrade dovecot | Jul 23, 2026 | Jul 23, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Mar 27, 2026 |
| Ubuntu | — | Upgrade dovecot-core | Apr 1, 2026 | Mar 31, 2026 |
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