CVE-2026-33250 Crash when receiving specially-crafted packets
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-33250?
CVE-2026-33250 is a high-severity vulnerability in longturn freeciv21, published on 23 Mar 2026.
Official description
Freeciv21 is a free open source, turn-based, empire-building strategy game. Versions prior to 3.1.1 crash with a stack overflow when receiving specially-crafted packets. A remote attacker can use this to take down any public server. A malicious server can use this to crash the game on the player's machine. Authentication is not needed and, by default, logs do not contain any useful information. All users should upgrade to Freeciv21 version 3.1.1. Running the server behind a firewall can help mitigate the issue for non-public servers. For local games, Freeciv21 restricts connections to the current user and is therefore not affected.
Which versions are affected by CVE-2026-33250?
Linux distribution packages (2)
freeciv openSUSE:Leap 16.0 | All versions | 3.2.4-bp160.1.1 |
freeciv openSUSE:Tumbleweed | All versions | 3.2.4-1.1 |
How do I fix CVE-2026-33250?
Upgrade to a fixed version.
Is CVE-2026-33250 being exploited?
There is no known exploitation of CVE-2026-33250 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-33250, DSA-6173-1, GHSA-f76g-6w3f-f6r3, MGASA-2026-0183, UBUNTU-CVE-2026-33250, USN-8754-1 and 2 more.