CVE-2026-49452: Kozea Weasyprint

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

WeasyPrint helps web developers to create PDF documents. Prior to 69.0, WeasyPrint embeds unescaped HTML presentational-hint attribute values into CSS in weasyprint/css/__init__.py when presentational_hints=True. The background attribute is inserted into a background-image:url() declaration and parsed by tinycss2.parse_blocks_contents(), allowing untrusted HTML to inject additional CSS declarations. Applications that render untrusted HTML with presentational hints enabled can be affected by CSS injection and server-side requests through injected url() values. This issue is fixed in version 69.0.

Affected products

• Kozea Weasyprint: before 69.0 (fixed in 69.0)

Published 2026-08-18. Last modified 2026-09-18.