UBUNTU-CVE-2025-46734

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Source
https://ubuntu.com/security/CVE-2025-46734
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-46734.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2025-46734
Upstream
Downstream
Published
2025-05-05T20:15:00Z
Modified
2026-04-22T19:52:12.950730Z
Severity
  • 6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

league/commonmark is a PHP Markdown parser. A cross-site scripting (XSS) vulnerability in the Attributes extension of the league/commonmark library (versions 1.5.0 through 2.6.x) allows remote attackers to insert malicious JavaScript calls into HTML. The league/commonmark library provides configuration options such as html_input: 'strip' and allow_unsafe_links: false to mitigate cross-site scripting (XSS) attacks by stripping raw HTML and disallowing unsafe links. However, when the Attributes Extension is enabled, it introduces a way for users to inject arbitrary HTML attributes into elements via Markdown syntax using curly braces. Version 2.7.0 contains three changes to prevent this XSS attack vector: All attributes starting with on are considered unsafe and blocked by default; support for an explicit allowlist of allowed HTML attributes; and manually-added href and src attributes now respect the existing allow_unsafe_links configuration option. If upgrading is not feasible, please consider disabling the AttributesExtension for untrusted users and/or filtering the rendered HTML through a library like HTMLPurifier.

References

Affected packages

Ubuntu:Pro:20.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark@1.3.1-1ubuntu2+esm1?arch=source&distro=esm-apps/focal

Affected ranges

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

Affected versions

1.*
1.1.2-1
1.2.0-1
1.3.0-1
1.3.1-1
1.3.1-1ubuntu2
1.3.1-1ubuntu2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-league-commonmark",
            "binary_version": "1.3.1-1ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-46734.json"

Ubuntu:Pro:22.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark@1.6.7-1ubuntu0.1~esm1?arch=source&distro=esm-apps/jammy

Affected ranges

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

Affected versions

1.*
1.5.7-2build1
1.6.6-1build1
1.6.7-1
1.6.7-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-league-commonmark",
            "binary_version": "1.6.7-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-46734.json"

Ubuntu:Pro:24.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark@2.4.2-2ubuntu0.1~esm1?arch=source&distro=esm-apps/noble

Affected ranges

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

Affected versions

2.*
2.3.9-1
2.4.1-1
2.4.2-1
2.4.2-2
2.4.2-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-league-commonmark",
            "binary_version": "2.4.2-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-46734.json"

Ubuntu:25.10 / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark@2.7.0-1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.6.1-2
2.6.2-1
2.7.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-league-commonmark",
            "binary_version": "2.7.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-46734.json"