Medium [CVE-2026-49452] CSS Injection via Presentational Hints
This medium-severity Red Hat Linux advisory covers CVE-2026-49452.
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Summary
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. This vulnerability allows a remote attacker to inject arbitrary CSS, potentially leading to information disclosure or the initiation of server-side requests through specially crafted url() values.
Red Hat Ansible Automation Platform 2.5 ships WeasyPrint 69.0, which already includes the fix for this vulnerability, and is therefore not affected. The WeasyPrint package in EPEL ships a version within the vulnerable range.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-79.
- < 69.0
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Escape attribute values before embedding into CSS, and restrict allowed values for presentational hints.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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