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DEBIAN-CVE-2026-33250

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-33250

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33250

freeciv

Source reference: /affected/0/package/name

Affected versions
3.0.6-1

Source reference: /affected/0/versions

Fixed versions
3.0.6-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

freeciv

Source reference: /affected/1/package/name

Affected versions
3.1.4+ds-2

Source reference: /affected/1/versions

Fixed versions
3.1.4+ds-2+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

freeciv

Source reference: /affected/2/package/name

Affected versions
3.1.4+ds-2

Source reference: /affected/2/versions

3.2.0+ds-1

Source reference: /affected/2/versions

3.2.1+ds-1

Source reference: /affected/2/versions

3.2.1+ds-2

Source reference: /affected/2/versions

3.2.2+ds-1

Source reference: /affected/2/versions

Fixed versions
3.2.4+ds-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.6-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "freeciv",
      "purl": "pkg:deb/debian/freeciv?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.0.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33250.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.1.4+ds-2+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "freeciv",
      "purl": "pkg:deb/debian/freeciv?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.1.4+ds-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33250.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.2.4+ds-1"
          }
        ]
      }
    ],
    "package": {
      "name": "freeciv",
      "purl": "pkg:deb/debian/freeciv?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.1.4+ds-2",
      "3.2.0+ds-1",
      "3.2.1+ds-1",
      "3.2.1+ds-2",
      "3.2.2+ds-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33250.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56793 · Revision 1
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Publisher date
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