CVE-2025-68616
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
In WeasyPrint prior to version 68.0, a server-side request forgery (SSRF) protection bypass exists in the default `url_fetcher`. Even if a developer implements a custom `url_fetcher` to block access to internal resources, an attacker can bypass this protection because the underlying `urllib` library automatically follows HTTP redirects without re-validating the new destination against the security policy.
Risk Assessment
The risk involves potential access to internal network services (e.g., localhost, cloud metadata endpoints), which could lead to sensitive data leakage or further infrastructure compromise.
Recommendation
Immediately update WeasyPrint to version 68.0 or later, which includes a fix for this SSRF bypass.
Other vulnerabilities in WeasyPrint
See all- CVE-2026-55073Medium
In WeasyPrint 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.
- CVE-2026-49452Medium
WeasyPrint before 69.0 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.
Original NVD description (English source)
WeasyPrint helps web developers to create PDF documents. Prior to version 68.0, a server-side request forgery (SSRF) protection bypass exists in WeasyPrint's `default_url_fetcher`. The vulnerability allows attackers to access internal network resources (such as `localhost` services or cloud metadata endpoints) even when a developer has implemented a custom `url_fetcher` to block such access. This occurs because the underlying `urllib` library follows HTTP redirects automatically without re-validating the new destination against the developer's security policy. Version 68.0 contains a patch for the issue.