CVE-2026-27852
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No publicly available exploits are known.
| CWE | CWE-400 |
| Vendor | open-xchange gmbh |
| Product | ox dovecot pro |
| Published | Aug 28, 2026 |
| Last Updated | Aug 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Open-Xchange GmbH / OX Dovecot Pro
2.3.0 < 2.3.22.2 3.0.0 < 3.0.7 3.1.0 < 3.1.6
Open-Xchange GmbH / OX Dovecot CE
2.3.0 < 2.4.5