CVE-2026-55554

CVE-2026-55554 · Dompdf: Chroot Validation Bypass

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 2.3 · Low · EPSS 0.5% · Fix available

Published

2026-07-28T19:28:43.838Z

Updated

2026-07-29T15:24:54.517Z

Stack: system · php

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