CVE-2024-23185 is a vulnerability in Dovecot where very large email headers can cause resource exhaustion during message parsing. The message-header-parser builds a buffer without size limits, leading to potentially large memory usage. This affects all Dovecot versions. Although typical mail transfer agents (MTAs) impose size limits that reduce risk, users appending large mails could cause denial of service to themselves or backend memory issues. No public exploits are known.