#VU124729 Resource exhaustion in Dovecot and OX Dovecot Pro - CVE-2026-27858

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Main Vulnerability Database Vulnerabilities #VU124729

#VU124729 Resource exhaustion in Dovecot and OX Dovecot Pro - CVE-2026-27858

Published: April 1, 2026


Vulnerability identifier: #VU124729
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-27858
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Dovecot
OX Dovecot Pro
Software vendor:
Dovecot

Description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in managesieve-login service when processing pre-authentication data. A remote attacker can send a specially crafted message before authentication to cause a denial of service.


Remediation

Install security update from vendor's website.

External links