CVE-2026-55554

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/dompdf/dompdf/releases/tag/v3.1.6	Release Notes
https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4	Exploit Third Party Advisory
https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:dompdf_project:dompdf:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-28 20:17

Updated : 2026-08-05 16:37

NVD link : CVE-2026-55554

Mitre link : CVE-2026-55554

CVE.ORG link : CVE-2026-55554

JSON object : View

Products Affected

dompdf_project

dompdf

CWE

CWE-20

Improper Input Validation

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