UBUNTU-CVE-2026-56003

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Source
https://ubuntu.com/security/CVE-2026-56003
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56003
Upstream
Downstream
Related
Published
2026-07-08T10:16:00Z
Modified
2026-07-21T13:10:19.405526932Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

References

Affected packages

Ubuntu:16.04:LTS
libxfont2

Package

Name
libxfont2
Purl
pkg:deb/ubuntu/libxfont2?arch=source&distro=xenial

Affected ranges

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

Affected versions

1:2.*
1:2.0.1-3~ubuntu16.04.1
1:2.0.1-3~ubuntu16.04.2
1:2.0.1-3~ubuntu16.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.1-3~ubuntu16.04.3",
            "binary_name": "libxfont2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:22.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.5-1ubuntu0.2

Affected versions

1:2.*
1:2.0.4-1build3
1:2.0.5-1
1:2.0.5-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.5-1ubuntu0.2",
            "binary_name": "libxfont2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:24.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.6-1+deb13u1build0.24.04.2

Affected versions

1:2.*
1:2.0.6-1
1:2.0.6-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.6-1+deb13u1build0.24.04.2",
            "binary_name": "libxfont2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:25.10
libxfont

Package

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

Affected ranges

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

Affected versions

1:2.*
1:2.0.6-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.6-1build1",
            "binary_name": "libxfont2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:26.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.6-2ubuntu0.2

Affected versions

1:2.*
1:2.0.6-1build1
1:2.0.6-1build2
1:2.0.6-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.6-2ubuntu0.2",
            "binary_name": "libxfont2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:Pro:14.04:LTS
libxfont

Package

Name
libxfont
Purl
pkg:deb/ubuntu/libxfont?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:1.4.7-1ubuntu0.4+esm2

Affected versions

1:1.*
1:1.4.6-1
1:1.4.6-1ubuntu1
1:1.4.7-1
1:1.4.7-1ubuntu0.1
1:1.4.7-1ubuntu0.2
1:1.4.7-1ubuntu0.3
1:1.4.7-1ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:1.4.7-1ubuntu0.4+esm2",
            "binary_name": "libxfont1"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:Pro:16.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:1.5.1-1ubuntu0.16.04.4+esm2

Affected versions

1:1.*
1:1.5.1-1
1:1.5.1-1ubuntu0.16.04.1
1:1.5.1-1ubuntu0.16.04.2
1:1.5.1-1ubuntu0.16.04.3
1:1.5.1-1ubuntu0.16.04.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:1.5.1-1ubuntu0.16.04.4+esm2",
            "binary_name": "libxfont1"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:Pro:18.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.3-1ubuntu0.1~esm2

Affected versions

1:2.*
1:2.0.1-3ubuntu1
1:2.0.1-4
1:2.0.1-4ubuntu1
1:2.0.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.3-1ubuntu0.1~esm2",
            "binary_name": "libxfont2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"
Ubuntu:Pro:20.04:LTS
libxfont

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.3-1ubuntu0.20.04.1~esm2

Affected versions

1:2.*
1:2.0.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.0.3-1ubuntu0.20.04.1~esm2",
            "binary_name": "libxfont2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56003.json"