Server-side Request Forgery (SSRF) Affecting css_parser package, versions >=2.2.0, <3.0.0
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Server-side Request Forgery (SSRF) vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-RUBY-CSSPARSER-17705229
- published30 Jun 2026
- disclosed29 Jun 2026
- creditJLLeitschuh
Introduced: 29 Jun 2026
NewCVE-2026-53727 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade css_parser to version 3.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the read_remote_file function. An attacker can access internal network resources or disclose arbitrary local files by supplying a crafted CSS file containing a malicious @import url(...) directive, which is processed without proper scheme or host filtering, allowing HTTP redirects to file URIs.