UBUNTU-CVE-2026-126205

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Source
https://ubuntu.com/security/CVE-2026-126205
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126205.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-126205
Upstream
Published
2026-11-13T00:00:00Z
Modified
2026-11-13T21:05:25Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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. Prior to 2.25.3, the Loofah HTML5 sanitizer checks href and xlink:href on elements in SVG_ALLOW_LOCAL_HREF with a regular expression whose line anchor and newline-matching whitespace cause an all-whitespace value to be rescanned from every line start. An attacker can submit an SVG reference element with a long multiline-whitespace attribute and consume CPU quadratically during sanitization. CRuby 3.1 and earlier and JRuby are affected, while CRuby 3.2 and later uses linear-time regular-expression matching. The default safelist reaches the vulnerable check without a configuration change. 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-2026-126205.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-2026-126205.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-2026-126205.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-2026-126205.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-2026-126205.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-2026-126205.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-2026-126205.json"