USN-8754-1: Freeciv vulnerability

Publication date

14 September 2026

Overview

Freeciv could be made to crash if it received specially crafted network traffic.


Packages

  • freeciv - Civilization turn based strategy game

Details

It was discovered that Freeciv incorrectly handled certain network packets,
resulting in a stack overflow. A remote attacker could possibly use this
issue to cause Freeciv clients or servers to crash, resulting in a denial
of service.

It was discovered that Freeciv incorrectly handled certain network packets,
resulting in a stack overflow. A remote attacker could possibly use this
issue to cause Freeciv clients or servers to crash, resulting in a denial
of service.

Update instructions

After a standard system update you need to restart Freeciv to make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
24.04 LTS noble freeciv –  3.1.0+ds-1ubuntu0.1~esm1  
freeciv-server –  3.1.0+ds-1ubuntu0.1~esm1  
22.04 LTS jammy freeciv –  2.6.6-1ubuntu0.1~esm1  
freeciv-server –  2.6.6-1ubuntu0.1~esm1  
20.04 LTS focal freeciv –  2.6.2-1ubuntu0.1~esm1  
freeciv-server –  2.6.2-1ubuntu0.1~esm1  
18.04 LTS bionic freeciv –  2.5.10-1ubuntu0.1~esm1  
freeciv-server –  2.5.10-1ubuntu0.1~esm1  
16.04 LTS xenial freeciv –  2.5.3-1ubuntu0.1~esm1
freeciv-server –  2.5.3-1ubuntu0.1~esm1

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


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