CVE-2026-27859 MEDIUM

CVE-2026-27859

Vendor Open-Xchange Gmbh
Product OX Dovecot Pro
Weakness CWE-400
Published March 27, 2026
Last update March 27, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
March 27, 2026 Record updated