CVE-2026-59943 Dompdf: Embedded SVG images can leak existence of files and directories within the filesystem

What is CVE-2026-59943?

CVE-2026-59943 is a medium-severity 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, if a malicious actor can supply unrestricted content for rendering by Dompdf they can utilize the SVG rendering functionality to leak filesystem information when rendering PDF files using image references within a data-URI encoded SVG document. Using an <image> element inside a data-URI embedded SVG, an attacker can attempt to embed other files via the href or xlink:href attributes. When processing a file that does not exist (e.g. file:///DOESNOTEXIST), dompdf behaves differently than it does when accessing a file or directory that actually exists on the filesystem. This issue has been fixed in version 3.16.

Weakness: CWE-209

Which versions are affected by CVE-2026-59943?

2 open source packages ship an affected version, including dompdf/dompdf. It affects 1 product.

Products include Dompdf Project Dompdf.

How do I fix CVE-2026-59943?

Upgrade dompdf/dompdf to 3.1.6 or later.

Is CVE-2026-59943 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59943 exists.

Other vulnerabilities in dompdf

• CVE-2023-24813 URI validation failure on SVG parsing. Bypass of CVE-2023-23924 Critical 10.0
• CVE-2023-23924 URI validation failure on SVG parsing in Dompdf Critical 10.0
• CVE-2021-3838 PHAR Deserialization in dompdf/dompdf Critical 9.8
• CVE-2021-3902 Improper Restriction of XML External Entity Reference in dompdf/dompdf Critical 9.8
• CVE-2022-28368 Remote code injection in dompdf/dompdf Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-59943, GHSA-j8qw-6jw8-r297, UBUNTU-CVE-2026-59943.