CVE-2026-27859 | Open-Xchange OX Dovecot Pro up to 2.4.0/3.0.2/3.1.0 Mail Message resource consumption (adv-2026-0001 / WID-SEC-2026-0891)

A vulnerability marked as problematic has been reported in Open-Xchange OX Dovecot Pro up to 2.4.0/3.0.2/3.1.0. Affected is an unknown function of the component Mail Message Handler. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2026-27859. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.