Bug 2526687 - CVE-2026-42393 dovecot: Dovecot: Information disclosure via timing attack on `doveadm` password/API key comparison [fedora-all]
Summary: CVE-2026-42393 dovecot: Dovecot: Information disclosure via timing attack on ...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: dovecot
Version: rawhide
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: ---
Assignee: Michal Hlavinka
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["e95c41f6-b703-4282-9036-f...
Depends On:
Blocks: CVE-2026-42393
TreeView+ depends on / blocked
 
Reported: 2026-09-01 07:27 UTC by Vladimir Vasilev
Modified: 2026-09-01 07:27 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


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Description Vladimir Vasilev 2026-09-01 07:27:43 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret. An attacker with access to the same network as the doveadm service, able to make repeated requests and measure response timing accurately, can learn the length of the secret, which reduces the effort needed to guess it. The secret value itself is not disclosed. Restrict network access to the doveadm service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.


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