Read the docs
TI-2026-36607 Aliases CVE-2026-49452GHSA-jhhc-3hcp-qhm5

WeasyPrint: CSS Injection via Presentational Hints

Priority HIGH 68CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00372 31st percentileScored 2026-11-07
Fix Fixed WeasyPrint (Kozea): 69.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KozeaWeasyPrintbefore 69.069.0Patch availableCNA
—weasyprint (PyPI)up to 68.1—No fix listedGHSA-jhhc-3hcp-qhm5
  • WeasyPrint VendorKozea Affected before 69.0 Fixed in 69.0 Patch available CNA
  • weasyprint (PyPI) Vendor— Affected up to 68.1 Fixed in — No fix listed GHSA-jhhc-3hcp-qhm5

Remediation

  • Fix · CNA WeasyPrint (Kozea) Fixed in 69.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Ansible Automation Platform 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-49452
  2. 2026-10-03 Alias added: GHSA-jhhc-3hcp-qhm5

References

Other 5

  • TI-2026-69644 Inefficient path parsing in CairoSVG enables denial of service CVSS 4.0HIGH 8.7
  • TI-2026-24451 CairoSVG vulnerable to Exponential DoS via recursive <use> element amplification CVSS 3.1HIGH 7.5
  • TI-2025-42134 WeasyPrint Vulnerable to Server-Side Request Forgery (SSRF) Protection Bypass via HTTP Redirect CVSS 3.1HIGH 7.5
  • TI-2026-39778 WeasyPrint restrictive URL fetcher bypass allows local file read and SSRF CVSS 3.1MEDIUM 6.2
  • TI-2023-12296 CairoSVG improperly processes SVG files loaded from external resources CVSS 3.1CRITICAL 9.9
  • TI-2026-68895 WeasyPrint passes EPS images to Ghostscript, risking code execution CVSS 3.1HIGH 8.8
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences