UBUNTU-CVE-2026-126203

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Source
https://ubuntu.com/security/CVE-2026-126203
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-126203
Upstream
Published
2026-11-13T00:00:00Z
Modified
2026-11-13T21:05:24Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.21.0 until 2.25.3, Loofah's HTML5 APIs Loofah.html5_fragment, Loofah.html5_document, and the scrub_html5_* methods can emit sanitized output that a browser reparses as different markup when used with Nokogiri before 1.19.5, because those Nokogiri versions do not escape angle brackets in attribute values. MathML can place markup inside an allowed attribute so the reparsed output becomes live HTML. The :strip scrubber is affected in every browser, while :prune and :escape are affected in WebKit browsers. Loofah's HTML4 APIs, Loofah::Helpers.sanitize, :whitewash, rails-html-sanitizer's default configuration, and JRuby are not affected. This issue is fixed in version 2.25.3.

References

Affected packages

Ubuntu:16.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.0.2-1
2.0.3-1
2.0.3-2
2.0.3-2+deb9u1build0.16.04.1
2.0.3-2+deb9u2build0.16.04.1
2.0.3-2+deb9u3build0.16.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.0.3-2+deb9u3build0.16.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:18.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.0.3-2
2.2.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.2.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:20.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.2.3-1
2.3.1+dfsg-1
2.4.0+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.4.0+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:22.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.12.0-1
2.13.0-1
2.13.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.13.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:24.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.21.3-1
2.21.4-1
2.22.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.22.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:26.04:LTS
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.24.1-1
2.25.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.25.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"
Ubuntu:26.10
ruby-loofah

Package

Name
ruby-loofah
Purl
pkg:deb/ubuntu/ruby-loofah?arch=source&distro=stonking

Affected ranges

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

Affected versions

2.*
2.25.0-1
2.25.1-2
2.25.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-loofah",
            "binary_version": "2.25.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126203.json"