Vulnerability · Published Jul 28, 2026 · Assigned by GitHub_M
CVE-2026-56722Dompdf: Local file read due to improper file path validation in SVG images encoded as data-URI
Medium 6.3
In plain English
A medium-severity improper input validation in dompdf from dompdf. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, aAn attacker who controls the HTML input can bypass this restriction by embedding a target file path inside an SVG image delivered through a data: URI, because dompdf processes the SVG twice and the second pass does not enforce the same protections as the first. When rendering, dompdf hands the SVG to the separate php-svg-lib library with external references forced on, and that library has no knowledge of the chroot directory, blocks only the phar:// scheme, and ultimately reads the referenced file with no path or protocol validation. This lets an external, unauthenticated attacker read arbitrary image files from the server's file system in the default configuration. This issue has been fixed in version 3.16.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | php-dompdf | no fix listed | DEBIAN-CVE-2026-56722 |
| Packagist | dompdf/dompdf | 3.1.6 | GHSA-cx96-42px-69fm |
| Ubuntu:22.04:LTS | php-dompdf | no fix listed | UBUNTU-CVE-2026-56722 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/dompdf/dompdf/security/advisories/GHSA-cx96-42px-69fm x_refsource_CONFIRM
- https://github.com/dompdf/dompdf/commit/6a58996865db05d8fede748507e50ac4b8c5bfd0 x_refsource_MISC
- https://github.com/dompdf/dompdf/commit/bf7b02f642e26007dedc5a22b3d6e15f9931120a x_refsource_MISC
- https://github.com/dompdf/dompdf/releases/tag/v3.1.6 x_refsource_MISC