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CVE-2026-55073

WeasyPrint restrictive URL fetcher bypass allows local file read and SSRF

CVSS 3.1 6.2 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-55073

Published

WeasyPrint helps web developers to create PDF documents. Prior to 70.0, server-side applications that configure a restrictive url_fetcher and pass attacker-influenced values to HTML.write_pdf() can have the restriction bypassed through the xmp_metadata or stylesheets options. In weasyprint/pdf/init.py, xmp_metadata calls select_source() without the document url_fetcher, allowing an accessible local file to be read and embedded verbatim in the output PDF. In weasyprint/document.py, stylesheets constructs CSS() without the document url_fetcher, allowing local or internal resource loading and propagating the permissive fetcher through nested CSS imports and url() references. The stylesheets channel applies fetched resources but does not by itself disclose stylesheet comments verbatim. This issue is fixed in version 70.0.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55073

Published

WeasyPrint

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Kozea",
                    "product": "WeasyPrint",
                    "versions": [
                        {
                            "version": "< 70.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON