UBUNTU-CVE-2026-55554

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Source
https://ubuntu.com/security/CVE-2026-55554
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55554.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55554
Upstream
Published
2026-07-30T00:00:00Z
Modified
2026-07-30T16:00:27.022057437Z
Severity
  • 2.3 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, the validateLocalUri() method enforces chroot boundaries with a strpos() prefix check after normalizing paths with  realpath() . Because normalization strips the trailing directory separator from  $chrootPath , the check only verifies that  $chrootPath  is a string prefix of $realfile, so a chroot of  /var/www  also matches sibling directories like /var/www2 , /var/www-admin, or /var/www_backup. An attacker who controls part of the rendered HTML could exploit this to escape the chroot and read sensitive files outside the allowed directory. This issue has been fixed in version 3.16.

References

Affected packages

Ubuntu:Pro:16.04:LTS / php-dompdf

Package

Name
php-dompdf
Purl
pkg:deb/ubuntu/php-dompdf?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

0.*
0.6.1+dfsg-2
0.6.1+dfsg-2build1
0.6.1+dfsg-2ubuntu1
0.6.1+dfsg-2ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-dompdf",
            "binary_version": "0.6.1+dfsg-2ubuntu1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55554.json"

Ubuntu:Pro:18.04:LTS / php-dompdf

Package

Name
php-dompdf
Purl
pkg:deb/ubuntu/php-dompdf?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

0.*
0.6.2+dfsg-3
0.6.2+dfsg-3ubuntu0.18.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-dompdf",
            "binary_version": "0.6.2+dfsg-3ubuntu0.18.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55554.json"

Ubuntu:20.04:LTS / php-dompdf

Package

Name
php-dompdf
Purl
pkg:deb/ubuntu/php-dompdf?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.6.2+dfsg-3
0.6.2+dfsg-3ubuntu0.20.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-dompdf",
            "binary_version": "0.6.2+dfsg-3ubuntu0.20.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55554.json"

Ubuntu:22.04:LTS / php-dompdf

Package

Name
php-dompdf
Purl
pkg:deb/ubuntu/php-dompdf?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.6.2+dfsg-3.1
0.6.2+dfsg-3.1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "php-dompdf",
            "binary_version": "0.6.2+dfsg-3.1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55554.json"