USN-4110-3: Dovecot regression

28 August 2019

Dovecot regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


USN-4110-1 introduced a regression in Dovecot.

Software Description

  • dovecot - IMAP and POP3 email server


USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a regression causing a wrong check. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04
dovecot-core - 1:
Ubuntu 18.04 LTS
dovecot-core - 1:
Ubuntu 16.04 LTS
dovecot-core - 1:2.2.22-1ubuntu2.12

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.