CVE-2026-27859 in Open-Xchange OX Dovecot Proinfo

Summary

A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.

Reservation

02/24/2026

Disclosure

03/27/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
353848	Open-Xchange OX Dovecot Pro Mail Message resource consumption	400	Not defined	Official fix	CVE-2026-27859

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