UBUNTU-CVE-2025-6021

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Source
https://ubuntu.com/security/CVE-2025-6021
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-6021.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-6021
Upstream
Downstream
Related
Published
2025-06-12T13:15:00Z
Modified
2025-09-08T17:06:51Z
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

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

References

Affected packages

Ubuntu:22.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.13+dfsg-1ubuntu0.8?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.13+dfsg-1ubuntu0.8

Affected versions

2.*

2.9.12+dfsg-4
2.9.12+dfsg-5
2.9.12+dfsg-6
2.9.13+dfsg-1
2.9.13+dfsg-1build1
2.9.13+dfsg-1ubuntu0.1
2.9.13+dfsg-1ubuntu0.2
2.9.13+dfsg-1ubuntu0.3
2.9.13+dfsg-1ubuntu0.4
2.9.13+dfsg-1ubuntu0.5
2.9.13+dfsg-1ubuntu0.6
2.9.13+dfsg-1ubuntu0.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.13+dfsg-1ubuntu0.8",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.13+dfsg-1ubuntu0.8",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.13+dfsg-1ubuntu0.8",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.13+dfsg-1ubuntu0.8",
            "binary_name": "python3-libxml2"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:24.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.14+dfsg-1.3ubuntu3.4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.14+dfsg-1.3ubuntu3.4

Affected versions

2.*

2.9.14+dfsg-1.3
2.9.14+dfsg-1.3build1
2.9.14+dfsg-1.3build2
2.9.14+dfsg-1.3build3
2.9.14+dfsg-1.3ubuntu1
2.9.14+dfsg-1.3ubuntu2
2.9.14+dfsg-1.3ubuntu3
2.9.14+dfsg-1.3ubuntu3.1
2.9.14+dfsg-1.3ubuntu3.2
2.9.14+dfsg-1.3ubuntu3.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.4",
            "binary_name": "python3-libxml2"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:25.04

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.12.7+dfsg+really2.9.14-0.4ubuntu0.2?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12.7+dfsg+really2.9.14-0.4ubuntu0.2

Affected versions

2.*

2.12.7+dfsg-3
2.12.7+dfsg+really2.9.14-0.2build1
2.12.7+dfsg+really2.9.14-0.2ubuntu2
2.12.7+dfsg+really2.9.14-0.2ubuntu3
2.12.7+dfsg+really2.9.14-0.2ubuntu4
2.12.7+dfsg+really2.9.14-0.2ubuntu5
2.12.7+dfsg+really2.9.14-0.4
2.12.7+dfsg+really2.9.14-0.4ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.12.7+dfsg+really2.9.14-0.4ubuntu0.2",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.12.7+dfsg+really2.9.14-0.4ubuntu0.2",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.12.7+dfsg+really2.9.14-0.4ubuntu0.2",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.12.7+dfsg+really2.9.14-0.4ubuntu0.2",
            "binary_name": "python3-libxml2"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:Pro:14.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.1+dfsg1-3ubuntu4.13+esm8?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.1+dfsg1-3ubuntu4.13+esm8

Affected versions

2.*

2.9.1+dfsg1-3ubuntu2
2.9.1+dfsg1-3ubuntu3
2.9.1+dfsg1-3ubuntu4
2.9.1+dfsg1-3ubuntu4.1
2.9.1+dfsg1-3ubuntu4.2
2.9.1+dfsg1-3ubuntu4.3
2.9.1+dfsg1-3ubuntu4.4
2.9.1+dfsg1-3ubuntu4.5
2.9.1+dfsg1-3ubuntu4.6
2.9.1+dfsg1-3ubuntu4.7
2.9.1+dfsg1-3ubuntu4.8
2.9.1+dfsg1-3ubuntu4.9
2.9.1+dfsg1-3ubuntu4.10
2.9.1+dfsg1-3ubuntu4.11
2.9.1+dfsg1-3ubuntu4.12
2.9.1+dfsg1-3ubuntu4.13
2.9.1+dfsg1-3ubuntu4.13+esm1
2.9.1+dfsg1-3ubuntu4.13+esm2
2.9.1+dfsg1-3ubuntu4.13+esm3
2.9.1+dfsg1-3ubuntu4.13+esm4
2.9.1+dfsg1-3ubuntu4.13+esm5
2.9.1+dfsg1-3ubuntu4.13+esm6
2.9.1+dfsg1-3ubuntu4.13+esm7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm8",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm8",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm8",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm8",
            "binary_name": "python-libxml2"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Ubuntu:Pro:16.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.3+dfsg1-1ubuntu0.7+esm9?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.3+dfsg1-1ubuntu0.7+esm9

Affected versions

2.*

2.9.2+zdfsg1-4
2.9.2+zdfsg1-4ubuntu1
2.9.2+zdfsg1-4ubuntu2
2.9.2+zdfsg1-4ubuntu3
2.9.3+dfsg1-1
2.9.3+dfsg1-1ubuntu0.1
2.9.3+dfsg1-1ubuntu0.2
2.9.3+dfsg1-1ubuntu0.3
2.9.3+dfsg1-1ubuntu0.4
2.9.3+dfsg1-1ubuntu0.5
2.9.3+dfsg1-1ubuntu0.6
2.9.3+dfsg1-1ubuntu0.7
2.9.3+dfsg1-1ubuntu0.7+esm1
2.9.3+dfsg1-1ubuntu0.7+esm2
2.9.3+dfsg1-1ubuntu0.7+esm3
2.9.3+dfsg1-1ubuntu0.7+esm4
2.9.3+dfsg1-1ubuntu0.7+esm5
2.9.3+dfsg1-1ubuntu0.7+esm6
2.9.3+dfsg1-1ubuntu0.7+esm7
2.9.3+dfsg1-1ubuntu0.7+esm8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm9",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm9",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm9",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm9",
            "binary_name": "python-libxml2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:18.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.4+dfsg1-6.1ubuntu1.9+esm4?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.4+dfsg1-6.1ubuntu1.9+esm4

Affected versions

2.*

2.9.4+dfsg1-4ubuntu1
2.9.4+dfsg1-5ubuntu1
2.9.4+dfsg1-5ubuntu2
2.9.4+dfsg1-5.1ubuntu1
2.9.4+dfsg1-5.2ubuntu1
2.9.4+dfsg1-6.1ubuntu1
2.9.4+dfsg1-6.1ubuntu1.2
2.9.4+dfsg1-6.1ubuntu1.3
2.9.4+dfsg1-6.1ubuntu1.4
2.9.4+dfsg1-6.1ubuntu1.5
2.9.4+dfsg1-6.1ubuntu1.6
2.9.4+dfsg1-6.1ubuntu1.7
2.9.4+dfsg1-6.1ubuntu1.8
2.9.4+dfsg1-6.1ubuntu1.9
2.9.4+dfsg1-6.1ubuntu1.9+esm1
2.9.4+dfsg1-6.1ubuntu1.9+esm2
2.9.4+dfsg1-6.1ubuntu1.9+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm4",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm4",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm4",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm4",
            "binary_name": "python-libxml2"
        },
        {
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm4",
            "binary_name": "python3-libxml2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:20.04:LTS

libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2@2.9.10+dfsg-5ubuntu0.20.04.10+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.10+dfsg-5ubuntu0.20.04.10+esm1

Affected versions

2.*

2.9.4+dfsg1-7ubuntu3
2.9.4+dfsg1-7ubuntu5
2.9.4+dfsg1-8ubuntu1
2.9.4+dfsg1-8ubuntu2
2.9.4+dfsg1-8ubuntu3
2.9.10+dfsg-1ubuntu3
2.9.10+dfsg-4build1
2.9.10+dfsg-5
2.9.10+dfsg-5ubuntu0.20.04.1
2.9.10+dfsg-5ubuntu0.20.04.2
2.9.10+dfsg-5ubuntu0.20.04.3
2.9.10+dfsg-5ubuntu0.20.04.4
2.9.10+dfsg-5ubuntu0.20.04.5
2.9.10+dfsg-5ubuntu0.20.04.6
2.9.10+dfsg-5ubuntu0.20.04.7
2.9.10+dfsg-5ubuntu0.20.04.8
2.9.10+dfsg-5ubuntu0.20.04.9
2.9.10+dfsg-5ubuntu0.20.04.10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
            "binary_name": "libxml2"
        },
        {
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
            "binary_name": "libxml2-dev"
        },
        {
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
            "binary_name": "libxml2-utils"
        },
        {
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
            "binary_name": "python-libxml2"
        },
        {
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
            "binary_name": "python3-libxml2"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}