Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M
CVE-2026-55073WeasyPrint restrictive URL fetcher bypass allows local file read and SSRF
Medium 6.2
In plain English
A medium-severity server-side request forgery in WeasyPrint from Kozea. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | weasyprint | no fix listed | DEBIAN-CVE-2026-55073 |
| Debian:13 | weasyprint | no fix listed | DEBIAN-CVE-2026-55073 |
| Debian:14 | weasyprint | 70.0-1 | DEBIAN-CVE-2026-55073 |
| PyPI | weasyprint | 70.0 | GHSA-jf6q-chmf-3h3v |
| PyPI | weasyprint | 70.0 | PYSEC-2026-3940 |
| Ubuntu:22.04:LTS | weasyprint | no fix listed | UBUNTU-CVE-2026-55073 |
| Ubuntu:24.04:LTS | weasyprint | no fix listed | UBUNTU-CVE-2026-55073 |
| Ubuntu:26.04:LTS | weasyprint | no fix listed | UBUNTU-CVE-2026-55073 |
| Ubuntu:26.10 | weasyprint | no fix listed | UBUNTU-CVE-2026-55073 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Kozea | WeasyPrint | < 70.0 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/Kozea/WeasyPrint/security/advisories/GHSA-jf6q-chmf-3h3v x_refsource_CONFIRM
- https://github.com/Kozea/WeasyPrint/commit/289e278439b017cd9263b4cd4727026987f86443 x_refsource_MISC
- https://github.com/Kozea/WeasyPrint/releases/tag/v70.0 x_refsource_MISC