CVE-2026-52687

Fixed in a distro release EPSS <1%CVSS 6.5

An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all connections it handles, which can cause degradation or denial of service for IMAP. Disable IMAP compression. Alternatively limit the number of connections handled by a single imap-login process, though this has a performance impact. Update to non-vulnerable version. No publicly available exploits are known.

Published 2026-08-28 · CVE record · OSV

Products: Open-Xchange GmbH OX Dovecot Pro, Open-Xchange GmbH OX Dovecot CE

Distro releases