USN-3941-1: Lua vulnerability

8 April 2019

lua5.3 vulnerability

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

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Lua could be made to crash if it received a specially crafted script.

Software Description

  • lua5.3 - Simple, extensible, embeddable programming language


Fady Othman discovered that Lua incorrectly handled certain scripts. 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 18.10
lua5.3 - 5.3.3-1ubuntu0.18.10.1
Ubuntu 18.04 LTS
lua5.3 - 5.3.3-1ubuntu0.18.04.1
Ubuntu 16.04 LTS
lua5.3 - 5.3.1-1ubuntu2.1

To update your system, please follow these instructions:

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