Riskcovery

CVE-2026-40014

State
Published
Severity
6.5 Medium
Published
Aug 28, 2026
Updated
Aug 28, 2026
Reserved
Apr 8, 2026

Read the record on cve.org

Description

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client issues a THREAD command on the affected mailbox, this can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage, kill the offending process and remove the offending message from the affected mailbox. Update to non-vulnerable version. No publicly available exploits are known.

Scores

CVSSScoreVectorSource
3.16.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HOX

Weaknesses

  • CWE-400 Uncontrolled Resource Consumption

Affected Products

ProductVersions
OX Dovecot ProOpen-Xchange GmbH
  • 2.3.0 to before 2.3.22.2Affected
  • 3.0.0 to before 3.0.7Affected
  • 3.1.0 to before 3.1.6Affected
OX Dovecot CEOpen-Xchange GmbH
  • 2.3.0 to before 2.4.5Affected

References

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