USN-3951-1: Dovecot vulnerability

23 April 2019

dovecot vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.10


Dovecot could be made to crash if it received specially crafted network traffic.

Software Description

  • dovecot - IMAP and POP3 email server


It was discovered that the Dovecot JSON encoder incorrectly handled certain invalid UTF-8 characters. A remote attacker could possibly use this issue to cause Dovecot to repeatedly crash, resulting in a denial of service.

Update instructions

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

Ubuntu 19.04
dovecot-core - 1:
Ubuntu 18.10
dovecot-core - 1:

To update your system, please follow these instructions:

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