UBUNTU-CVE-2026-90556

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Source

https://ubuntu.com/security/CVE-2026-90556

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-90556

Upstream

CVE-2026-90556

Published

2026-09-14T00:00:00Z

Modified

2026-09-14T11:18:29Z

Severity

7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
8.5 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

References

Affected packages

Ubuntu:16.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.5.1-1

2.5.2-1

2.5.3-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.5.3-1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.5.3-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"

Ubuntu:18.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.5.9-1

2.5.10-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.5.10-1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.5.10-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"

Ubuntu:20.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.6.0-3

2.6.0-4

2.6.1-1

2.6.2-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.6.2-1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.6.2-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"

Ubuntu:22.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.6.3-1

2.6.5-1

2.6.6-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-client-gtk",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "2.6.6-1"
        },
        {
            "binary_name": "freeciv-sound-standard",
            "binary_version": "2.6.6-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"

Ubuntu:24.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

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

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-ruleset-tools",
            "binary_version": "3.1.0+ds-1build5"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "3.1.0+ds-1build5"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"

Ubuntu:26.04:LTS

freeciv

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.2.0+ds-1

3.2.1+ds-1

3.2.1+ds-1build1

3.2.2+ds-1

3.2.4+ds-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "freeciv",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-client-extras",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-client-gtk3",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-client-gtk4",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-client-qt",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-client-sdl",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-data",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-ruleset-tools",
            "binary_version": "3.2.4+ds-1"
        },
        {
            "binary_name": "freeciv-server",
            "binary_version": "3.2.4+ds-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90556.json"