Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Dompdf Project | Dompdf | < 3.1.6 |
Related Weaknesses (CWE)
References
- https://github.com/dompdf/dompdf/releases/tag/v3.1.6Release Notes
- https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4ExploitThird Party Advisory
- https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4ExploitThird Party Advisory
FAQ
What is CVE-2026-55554?
CVE-2026-55554 is a vulnerability with a CVSS score of 7.5 (HIGH). 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() ....
How severe is CVE-2026-55554?
CVE-2026-55554 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55554?
Check the references section above for vendor advisories and patch information. Affected products include: Dompdf Project Dompdf.