UBUNTU-CVE-2026-53727

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Source
https://ubuntu.com/security/CVE-2026-53727
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-53727
Upstream
Published
2026-07-17T21:17:00Z
Modified
2026-07-29T10:18:37.122339254Z
Severity
  • 8.9 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

cssparser is a Ruby CSS parser. From 2.2.0 until 3.0.0, CssParser::Parser#readremotefile in lib/cssparser/parser.rb, and therefore loaduri! and the @import-following branch of addblock!, issued HTTP and HTTPS requests against any host, port, and URI without a scheme allowlist, host or IP filtering, or protection against link-local, loopback, or RFC-1918 addresses. Location: redirects were followed recursively back into the same function, which also serviced file:// URIs, so a single attacker-controlled HTTP redirect could upgrade the bug from SSRF to arbitrary local file disclosure. Any consumer of cssparser that hands it attacker-influenced CSS together with a baseuri: option is exposed. This issue is fixed in version 3.0.0.

References

Affected packages

Ubuntu:16.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.3.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.3.6-1",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"
Ubuntu:18.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.3.6-1
1.6.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.0-1",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"
Ubuntu:20.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.6.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.0-1",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"
Ubuntu:22.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.6.0-1
1.6.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.6.0-2",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"
Ubuntu:24.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.6.0-2
1.16.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.16.0-1",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"
Ubuntu:26.04:LTS
ruby-css-parser

Package

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

Affected ranges

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

Affected versions

1.*
1.19.0-1
1.21.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.21.1-1",
            "binary_name": "ruby-css-parser"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-53727.json"