CVE-2026-49452
WeasyPrint: CSS Injection via Presentational Hints
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-74 |
| Vendor | kozea |
| Product | weasyprint |
| Published | Aug 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Kozea / WeasyPrint
< 69.0
References
github.com: https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jhhc-3hcp-qhm5 github.com: https://github.com/Kozea/WeasyPrint/pull/2773 github.com: https://github.com/Kozea/WeasyPrint/commit/e158264e33fa399b29f415d30719c1d85a55df1d github.com: https://github.com/Kozea/WeasyPrint/releases/tag/v69.0