USN-4040-1: Expat vulnerability

26 June 2019

expat vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Expat could be made to consume a high amount of RAM and CPU resources if it received a specially crafted XML file.

Software Description

  • expat - XML parsing C library


It was discovered that Expat incorrectly handled certain XML files. An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 19.04
libexpat1 - 2.2.6-1ubuntu0.19.04
Ubuntu 18.10
libexpat1 - 2.2.6-1ubuntu0.18.10
Ubuntu 18.04 LTS
libexpat1 - 2.2.5-3ubuntu0.1
Ubuntu 16.04 LTS
lib64expat1 - 2.1.0-7ubuntu0.16.04.4
libexpat1 - 2.1.0-7ubuntu0.16.04.4

To update your system, please follow these instructions:

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