CVE-2026-40015: Out-of-bounds Read in Open-Xchange GmbH OX Dovecot Pro
An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause degradation of service for IMAP. Disable IMAP hibernation. Update to non-vulnerable version. No publicly available exploits are known.
CVE-2026-40015: Out-of-bounds Read in Open-Xchange GmbH OX Dovecot Pro
Description
An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause degradation of service for IMAP. Disable IMAP hibernation. Update to non-vulnerable version. No publicly available exploits are known.
CVSS v3.1
Score 4.3medium
Affected software
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-04-08T09:59:59.342Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a916f8aacd9273b49cf91ff
Added to database: 08/28/2026, 11:22:50 UTC
Last updated: 08/28/2026, 11:22:50 UTC
Views: 1
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