CVE-2026-59943: Information Disclosure

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.

Is your site exposed to CVE-2026-59943?

Run a free security scan — no signup, results in seconds.

Weakness Type (CWE)

CWE-209 CWE-209

References

Other References

https://github.com/dompdf/dompdf/commit/6a58996865db05d8fede748507e50ac4b8c5bfd0 https://github.com/dompdf/dompdf/releases/tag/v3.1.6 https://github.com/dompdf/dompdf/security/advisories/GHSA-j8qw-6jw8-r297

Frequently Asked Questions

What is CVE-2026-59943? +

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.

How do I check if I'm vulnerable to CVE-2026-59943? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-3259

A Generation of Error Message Containing Sensitive Information vulnerability in the Materialized View Refresh mechanism in Google BigQuery on Google …

CVE-2025-40653

User enumeration vulnerability in M3M Printer Server Web. This issue occurs during user authentication, where a difference in error messages …

CVE-2023-40457

The BGP daemon in Extreme Networks ExtremeXOS (aka EXOS) 30.7.1.1 allows an attacker (who is not on a directly connected …

CVE-2025-9977

Value provided in one of POST parameters sent during the process of logging in to Times Software E-Payroll is not …

CVE-2025-13596

A sensitive information disclosure vulnerability exists in the error handling component of ATISoluciones CIGES Application version 2.15.6 and earlier. When …

CVE-2026-66009

Parse Server versions >= 9.0.0 before 9.10.0-alpha.5 and >= 8.2.2 before 8.6.86 return GraphQL validation error messages that name required …

CVE-2026-59943