Kozea WeasyPrint up to 69.x Image Loading Path weasyprint/images.py input validation

Summaryinfo

A vulnerability identified as critical has been detected in Kozea WeasyPrint up to 69.x. Affected by this issue is some unknown functionality of the file weasyprint/images.py of the component Image Loading Path. The manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-106443. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Kozea WeasyPrint up to 69.x and classified as critical. This issue affects some unknown functionality of the file weasyprint/images.py of the component Image Loading Path. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

WeasyPrint helps web developers to create PDF documents. Prior to 70.0, the image-loading path in weasyprint/images.py passes fetched image bytes from HTML img URLs, CSS image values, SVG image references, and data URIs to Pillow's generic image dispatcher without excluding EPS or PostScript formats. On hosts with Ghostscript installed, Pillow EpsImagePlugin invokes the interpreter for attacker-controlled PostScript, which can produce interpreter-permitted effects and can lead to remote code execution when the installed Ghostscript version has a usable sandbox bypass. Hosts without Ghostscript do not reach this rasterization path. This issue is fixed in version 70.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-106443 since 10/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available.

Upgrading to version 70.0 eliminates this vulnerability.

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Productinfo

Vendor

• Kozea

Name

• WeasyPrint

Version

• 69.x

Website

• Product: https://github.com/Kozea/WeasyPrint/

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