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

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-28 · updated 2026-08-04
Weakness: CWE-209

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.

Affected products

dompdf: before 3.1.6 — fixed in 3.1.6
Packagist Dompdf/Dompdf: before 3.1.6; v0.6.0, v0.6.1, v0.6.2, v0.7.0, v0.7.0-beta, v0.7.0-beta2 (+33) — fixed in 3.1.6

How to fix

Upgrade to a fixed version: dompdf 3.1.6; Packagist Dompdf/Dompdf 3.1.6. Check the vendor advisory for mitigations.

References

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