CVE-2026-55554
An attacker who controls part of the rendered HTML could exploit this to escape the chroot and read sensitive files outside the allowed directory.
Does this matter?
Lower severity and a low EPSS score (0.33%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 2.3 LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- dompdf project/dompdf
- Source
- security-advisories@github.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.