CVE-2026-56722 Dompdf: Local file read due to improper file path validation in SVG images encoded as data-URI
An attacker can read arbitrary image files from the server by embedding malicious paths in SVG data-URIs within HTML input processed by Dompdf.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56722?
CVE-2026-56722 is a medium-severity path traversal vulnerability in dompdf, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-20
Which versions are affected by CVE-2026-56722?
2 open source packages ship an affected version, including dompdf/dompdf. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
dompdf/dompdf Packagist | All versions | 3.1.6 |
dompdf/dompdf Packagist | All versions | 3.1.6 |
Products include Dompdf Project Dompdf.
How do I fix CVE-2026-56722?
Upgrade dompdf/dompdf to 3.1.6 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-56722 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56722 exists.
Other vulnerabilities in dompdf
- CVE-2023-24813 URI validation failure on SVG parsing. Bypass of CVE-2023-23924
- CVE-2023-23924 URI validation failure on SVG parsing in Dompdf
- CVE-2021-3838 PHAR Deserialization in dompdf/dompdf
- CVE-2021-3902 Improper Restriction of XML External Entity Reference in dompdf/dompdf
- CVE-2022-28368 Remote code injection in dompdf/dompdf
Sources
Also known as DEBIAN-CVE-2026-56722, GHSA-cx96-42px-69fm, UBUNTU-CVE-2026-56722.