USN-3421-1: Libidn2 vulnerability

18 September 2017

libidn2-0 vulnerability

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

  • Ubuntu 17.04


Libidn2 could be made to crash if it received specially crafted input.

Software Description

  • libidn2-0 - Internationalized domain names (IDNA2008) library


It was discovered that Libidn2 incorrectly handled certain input. A remote attacker could possibly use this issue to cause Libidn2 to crash, resulting in a denial of service.

Update instructions

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

Ubuntu 17.04
idn2 - 0.16-1ubuntu0.1
libidn2-0 - 0.16-1ubuntu0.1

To update your system, please follow these instructions:

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