CVE-2026-33250
freeciv: Freeciv21 is a free open source, turn-based, empire-building strategy game
CVE-2026-33250 is fixed in 10 products on 1 platform, first by DSA-6173-1, released March 21, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0085
58th percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| freeciv · Debian 12.15 (bookworm) | 3.0.6-1+deb12u1 | DSA-6173-1 | Mar 21, 2026 |
| freeciv · Debian 13.5 (trixie) | 3.1.4+ds-2+deb13u1 | DSA-6173-1 | Mar 21, 2026 |
| freeciv · Debian 14 | 3.2.4+ds-1 | DEBIAN-CVE-2026-33250 | Mar 24, 2026 |
| freeciv · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv · opensuse-leap 16.0 | 3.2.4-bp160.1.1 | OPENSUSE-SU-2026:20423-1 | Mar 23, 2026 |
| freeciv-client-extras · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-client-extras 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-extras · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-client-extras 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-extras · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-client-extras 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-extras · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-client-extras 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-client-gtk 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-client-gtk 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-client-gtk 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk3 · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-client-gtk3 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk3 · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-client-gtk3 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk3 · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-client-gtk3 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-gtk3 · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-client-gtk3 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-qt · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-client-qt 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-qt · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-client-qt 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-qt · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-client-qt 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-qt · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-client-qt 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-sdl · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-client-sdl 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-sdl · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-client-sdl 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-sdl · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-client-sdl 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-client-sdl · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-client-sdl 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-data · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-data 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-data · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-data 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-data · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-data 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-data · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-data 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-ruleset-tools · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-ruleset-tools 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-server · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-server 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-server · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-server 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-server · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-server 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-server · Ubuntu 24.04.5 LTS (noble) | 3.1.0+ds-1ubuntu0.1~esm1 | freeciv-server 3.1.0+ds-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-sound-standard · Ubuntu 18.04.6 LTS (bionic) | 2.5.10-1ubuntu0.1~esm1 | freeciv-sound-standard 2.5.10-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-sound-standard · Ubuntu 20.04 LTS (focal) | 2.6.2-1ubuntu0.1~esm1 | freeciv-sound-standard 2.6.2-1ubuntu0.1~esm1 | Mar 23, 2026 |
| freeciv-sound-standard · Ubuntu 22.04.1 LTS (jammy) | 2.6.6-1ubuntu0.1~esm1 | freeciv-sound-standard 2.6.6-1ubuntu0.1~esm1 | Mar 23, 2026 |
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