UBUNTU-CVE-2026-33250

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Source
https://ubuntu.com/security/CVE-2026-33250
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33250
Upstream
Downstream
Related
Published
2026-03-24T00:16:00Z
Modified
2026-09-14T22:00:28Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:25.10
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.1.4+ds-2
3.2.0+ds-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-client-gtk4",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-ruleset-tools",
            "binary_version": "3.2.0+ds-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "3.2.0+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"
Ubuntu:Pro:16.04:LTS
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.5.3-1ubuntu0.1~esm1

Affected versions

2.*
2.5.1-1
2.5.2-1
2.5.3-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.5.3-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"
Ubuntu:Pro:18.04:LTS
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.5.10-1ubuntu0.1~esm1

Affected versions

2.*
2.5.9-1
2.5.10-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.5.10-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"
Ubuntu:Pro:20.04:LTS
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.6.2-1ubuntu0.1~esm1

Affected versions

2.*
2.6.0-3
2.6.0-4
2.6.1-1
2.6.2-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.6.2-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"
Ubuntu:Pro:22.04:LTS
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.6.6-1ubuntu0.1~esm1

Affected versions

2.*
2.6.3-1
2.6.5-1
2.6.6-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.6.6-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"
Ubuntu:Pro:24.04:LTS
freeciv

Package

Name
freeciv
Purl
pkg:deb/ubuntu/freeciv?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.1.0+ds-1ubuntu0.1~esm1

Affected versions

3.*
3.0.8-1
3.0.8-2
3.0.8-2build1
3.1.0+ds-1build3
3.1.0+ds-1build4
3.1.0+ds-1build5

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-ruleset-tools",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "3.1.0+ds-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33250.json"