CVE-2026-47088

Name	CVE-2026-47088
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cyrus-imapd (PTS)	bullseye	3.2.6-2+deb11u2	vulnerable
	bullseye (security)	3.2.6-2+deb11u4	vulnerable
	bookworm	3.6.1-4+deb12u4	vulnerable
	bookworm (security)	3.6.1-4+deb12u2	vulnerable
	trixie	3.10.2-1	vulnerable
	forky	3.12.2-1	vulnerable
	sid	3.12.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cyrus-imapd	source	(unstable)	3.12.3-1

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html