Bug 2452171 (CVE-2026-27856) - CVE-2026-27856 dovecot: Doveadm: Full access via timing oracle attack in credential verification
Summary: CVE-2026-27856 dovecot: Doveadm: Full access via timing oracle attack in cred...
Keywords:
Status: NEW
Alias: CVE-2026-27856
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-27 09:01 UTC by OSIDB Bzimport
Modified: 2026-06-17 12:02 UTC (History)
2 users (show)

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

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:26564 0 None None None 2026-06-17 12:02:13 UTC

Description OSIDB Bzimport 2026-03-27 09:01:52 UTC 
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Comment 3 errata-xmlrpc 2026-06-17 12:02:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:26564 https://access.redhat.com/errata/RHSA-2026:26564
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