Timing Attack 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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Test your applications- Snyk IDSNYK-UNMANAGED-DOVECOT-20078947
- published24 Sept 2026
- disclosed28 Aug 2026
- creditUnknown
Introduced: 28 Aug 2026
CVE-2026-42393 (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 Timing Attack via the doveadm password and API key comparison process. An attacker can infer the length of the configured secret by making repeated requests and accurately measuring response times, which reduces the effort needed to guess the secret value. The secret itself is not directly disclosed.
Workaround
This vulnerability can be mitigated by restricting network access to the doveadm service to only trusted clients using firewall rules to limit inbound connections from known, secure IP addresses or subnets.