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Improper Input Validation Affecting freeciv package, versions <3.0.6-1+deb12u1

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.82% (53rd percentile)

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  • Snyk IDSNYK-DEBIAN12-FREECIV-15763068
  • published24 Mar 2026
  • disclosed24 Mar 2026
Report a new vulnerability Found a mistake?

Introduced: 24 Mar 2026

CVE-2026-33250  (opens in a new tab)
CWE-20  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade Debian:12 freeciv to version 3.0.6-1+deb12u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freeciv package and not the freeciv package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.