CVE-2026-47088: Cyrusimap Cyrus Imap

Low severity, CVSS 3.1. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME comment parsing. An authenticated IMAP user could craft an email message containing an RFC 822 comment ending with a backslash. When parsing the message, the server would read past the message's end in memory, and read into the heap, returning the read content to the user.

Affected products

• Cyrusimap Cyrus Imap: before 3.12.3 (fixed in 3.12.3)

Published 2026-07-16. Last modified 2026-07-17.