CVE-2026-33606 Command injection in OX Dovecot CE
Attackers can inject dsync protocol commands via crafted mail content, modifying mailbox state or causing errors during migration or replication.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-33606?
CVE-2026-33606 is a medium-severity command injection vulnerability in Open-Xchange GmbH OX Dovecot CE, published on 28 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-93
Which versions are affected by CVE-2026-33606?
How do I fix CVE-2026-33606?
Upgrade to a fixed version.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-33606 being exploited?
There is no known exploitation of CVE-2026-33606 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-33606, AZL-98304, DEBIAN-CVE-2026-33606, GHSA-wf8m-g4w9-3rc5, UBUNTU-CVE-2026-33606.