CVE-2026-27856

dovecot: Doveadm: Full access via timing oracle attack in credential verification

Published Mar 27, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4556-1 dovecot security update
Debian DSA Debian DSA DSA-6197-1 dovecot security update
Ubuntu USN Ubuntu USN USN-8136-1 Dovecot vulnerabilities
History
Type Values Removed Values Added
First Time appeared Dovecot
Dovecot dovecot
Open-xchange dovecot
Weaknesses NVD-CWE-Other
CPEs cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*
Vendors & Products Dovecot
Dovecot dovecot
Open-xchange dovecot
Type Values Removed Values Added
Title Timing Oracle Allows Credential Harvesting in OX Dovecot Pro dovecot: Doveadm: Full access via timing oracle attack in credential verification
Weaknesses CWE-208
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
First Time appeared Open-xchange
Open-xchange ox Dovecot Pro
Vendors & Products Open-xchange
Open-xchange ox Dovecot Pro
Type Values Removed Values Added
Title Timing Oracle Allows Credential Harvesting in OX Dovecot Pro
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Weaknesses CWE-287
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Sources

Status
PUBLISHED
Assigner
OX
Published
Updated
Jul 15, 2026, 1:12 AM
Reserved
Feb 24, 2026, 8:46 AM
Status
Modified
Published
Mar 27, 2026, 9:16 AM
Modified
Oct 26, 2026, 9:10 PM
Severity
Important
Public date
Mar 27, 2026, 8:10 AM