UBUNTU-CVE-2026-123784

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Source
https://ubuntu.com/security/CVE-2026-123784
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-123784
Upstream
Published
2026-11-09T00:00:00Z
Modified
2026-11-10T02:50:22Z
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

Fluxbox through 1.3.7 contains an OS command injection vulnerability in RootTheme::reconfigTheme() that allows attackers to execute commands via crafted style background values. Attackers can embed shell metacharacters in background pixmap paths, random directories, or gradient texture text, which are concatenated unescaped into an fbsetbg command run via $SHELL -c when the style loads.

References

Affected packages

Ubuntu:16.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.5-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.5-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:18.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.5-2
1.3.5-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.5-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:20.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.5-2build1
1.3.5-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.5-2build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:22.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.5-2build2
1.3.5-2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.5-2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:24.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.7-1
1.3.7-1build1
1.3.7-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.7-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:26.04:LTS
fluxbox

Package

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

Affected ranges

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

Affected versions

1.*
1.3.7-1build2
1.3.7-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.7-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"
Ubuntu:26.10
fluxbox

Package

Name
fluxbox
Purl
pkg:deb/ubuntu/fluxbox?arch=source&distro=stonking

Affected ranges

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

Affected versions

1.*
1.3.7-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "fluxbox",
            "binary_version": "1.3.7-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-123784.json"