Several security issues were fixed in libjpeg-turbo.

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Ubuntu Security Notice USN-4190-1
November 13, 2019

libjpeg-turbo vulnerabilities
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in libjpeg-turbo.

Software Description:
- libjpeg-turbo: library for handling JPEG files

Details:

It was discovered that libjpeg-turbo incorrectly handled certain BMP images.
An attacker could possibly use this issue to expose sensitive information.
This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
(CVE-2018-14498)

It was discovered that libjpeg-turbo incorrectly handled certain JPEG images.
An attacker could possibly use this issue to expose sensitive information.
This issue only affected Ubuntu 19.04. (CVE-2018-19664)

It was discovered that libjpeg-turbo incorrectly handled certain BMP images.
An attacker could possibly use this issue to execute arbitrary code. This
issue only affected Ubuntu 19.04. (CVE-2018-20330)

It was discovered that libjpeg-turbo incorrectly handled certain JPEG images.
An attacker could possibly cause a denial of service or execute arbitrary code.
(CVE-2019-2201)

Update instructions:

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

Ubuntu 19.04:
  libjpeg-turbo8                  2.0.1-0ubuntu2.2

Ubuntu 18.04 LTS:
  libjpeg-turbo8                  1.5.2-0ubuntu5.18.04.3

Ubuntu 16.04 LTS:
  libjpeg-turbo8                  1.4.2-0ubuntu3.3

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

References:
  https://usn.ubuntu.com/4190-1
  CVE-2018-14498, CVE-2018-19664, CVE-2018-20330, CVE-2019-2201

Package Information:
  https://launchpad.net/ubuntu/+source/libjpeg-turbo/2.0.1-0ubuntu2.2
  https://launchpad.net/ubuntu/+source/libjpeg-turbo/1.5.2-0ubuntu5.18.04.3
  https://launchpad.net/ubuntu/+source/libjpeg-turbo/1.4.2-0ubuntu3.3