Description
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Open-Xchange GmbH OX Dovecot Pro
Default version status: unaffected
0 to ≤ 2.3.0affected
References
- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json ↗
- https://access.redhat.com/security/cve/CVE-2026-27856 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2452171 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27856.json ↗
- https://access.redhat.com/errata/RHSA-2026:26564 ↗