VDB
CVE-2026-40015
CVE-2026-40015
PUBLISHED
CVSS 4.3 MEDIUM
Reported by OX · Published August 28, 2026
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.
Risk Scores
CVSS 3.1
4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro | 2.3.0, 3.0.0, 3.1.0 |
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0 |
| Open-Xchange GmbH | OX Dovecot CE | 2.3.0 |
| Open-Xchange GmbH | OX Dovecot Pro | 2.3.0, 3.0.0, 3.1.0 |
| alpine | dovecot | 0, 0, 0 |
Timeline
- Aug 28, 2026 CVE Published
- Aug 28, 2026 Coalition ESS Score
- Aug 29, 2026 EPSS Score
- Sep 2, 2026 Security Advisory
- Sep 5, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 26, 2026 EPSS Score
- Sep 29, 2026 EPSS Score