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.

• CWE-20

• https://github.com/dompdf/dompdf/releases/tag/v3.1.6Release Notes
• https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4Exploit, Third Party Advisory
• https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4Exploit, Third Party Advisory

Published

Jul 28, 2026

Last Modified

Aug 5, 2026

Status

Analyzed

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