Several security issues were fixed in GD.
It was discovered that GD incorrectly handled certain images. An attacker could possibly use this issue to execute arbitrary code. (CVE-2018-1000222)
27 August 2018
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in GD.
It was discovered that GD incorrectly handled certain images. An attacker could possibly use this issue to execute arbitrary code. (CVE-2018-1000222)
It was discovered that GD incorrectly handled certain GIF files. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-5711)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.