Unchecked Input for Loop Condition Affecting dovecot package, versions [2.3.0,2.4.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-33607 (opens in a new tab)How to fix?
Upgrade dovecot to version 2.4.5 or higher.
Overview
Affected versions of this package are vulnerable to Unchecked Input for Loop Condition in the IMAP LIST command. An attacker can cause excessive CPU consumption by repeatedly issuing crafted IMAP LIST requests after authentication. This can result in service degradation or complete unavailability of the IMAP server for legitimate users.
Workaround
This vulnerability can be mitigated by restricting access to the IMAP service to trusted networks or localhost using firewall rules or Dovecot's configuration. Additionally, system monitoring for abnormal CPU utilization by Dovecot processes can help detect and respond to exploitation attempts.