CVE-2026-40015 — MEDIUM (4.3)

Vulnerability 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 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Related Weaknesses (CWE)

CWE-125

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxd

FAQ

What is CVE-2026-40015?

CVE-2026-40015 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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. Th...

How severe is CVE-2026-40015?

CVE-2026-40015 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-40015?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.