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[USN-8754-1] Freeciv vulnerability

Posted on 14 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8754-1
September 14, 2026

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- 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.

Update instructions:

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

Ubuntu 24.04 LTS
freeciv 3.1.0+ds-1ubuntu0.1~esm1
Available with Ubuntu Pro
freeciv-server 3.1.0+ds-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
freeciv 2.6.6-1ubuntu0.1~esm1
Available with Ubuntu Pro
freeciv-server 2.6.6-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
freeciv 2.6.2-1ubuntu0.1~esm1
Available with Ubuntu Pro
freeciv-server 2.6.2-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
freeciv 2.5.10-1ubuntu0.1~esm1
Available with Ubuntu Pro
freeciv-server 2.5.10-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
freeciv 2.5.3-1ubuntu0.1~esm1
Available with Ubuntu Pro
freeciv-server 2.5.3-1ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8754-1
CVE-2026-33250

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