CVE-2026-42392 Information disclosure in OX Dovecot CE
Authenticated attackers can disclose process memory via invalid IMAP URLFETCH commands, potentially exposing sensitive data in Dovecot servers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42392?
CVE-2026-42392 is a medium-severity vulnerability in Open-Xchange GmbH OX Dovecot CE, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH functionality. Update to non-vulnerable version. No publicly available exploits are known.
Weakness: CWE-200
Which versions are affected by CVE-2026-42392?
How do I fix CVE-2026-42392?
Upgrade to a fixed version.
Is CVE-2026-42392 being exploited?
There is no known exploitation of CVE-2026-42392 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-42392, AZL-98277, DEBIAN-CVE-2026-42392, GHSA-cq8p-2j3r-5hxq, UBUNTU-CVE-2026-42392.