CVE-2026-33606

Name	CVE-2026-33606
Description	Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example during a migration. Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. No publicly available exploits are known.
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)
References	DSA-6526-1
Debian Bugs	1146018

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dovecot (PTS)	bookworm, bookworm (security)	1:2.3.19.1+dfsg1-2.1+deb12u6	vulnerable
	trixie	1:2.4.1+dfsg1-6+deb13u6	vulnerable
	trixie (security)	1:2.4.1+dfsg1-6+deb13u7	fixed
	forky	1:2.4.5+dfsg1-2	fixed
	sid	1:2.4.5+dfsg1-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
dovecot	source	trixie	1:2.4.1+dfsg1-6+deb13u7		DSA-6526-1
dovecot	source	(unstable)	1:2.4.5+dfsg1-1			1146018

Notes

https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html#cve-2026-33606-dsync-mail-content-can-cause-dsync-protocol-injection
Fixed by: https://github.com/dovecot/core/commit/bd707cab9decd4a069c9cdfd3e28d28cf9346fdd
Fixed by: https://github.com/dovecot/core/commit/7d782e5f5e51f63483393a460594d6a8f920b6d6