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[ CVE-2026-61846 · Published 30 Oct 2026 ]

Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage

CVSS 6.3 EPSS <1%Fix available

[ Description ]Official description

Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass recursively parses `CSS simple blocks and functions` without a depth guard. An attacker-controlled CSS value containing deeply nested blocks or functions can recurse until Ruby raises `SystemStackError`: stack level too deep, or cause excessive memory usage. Version 1.0.7 adds a configurable depth limit with a conservative default. This issue is fixed in version 1.0.7.

[ Fixes ]Fixes and patches

  • crass 1.0.7Fixed version · GitHub Advisories · rubygems package crass: upgrade to 1.0.7 or later (affected < 1.0.7)

[ Packages ]Affected open-source packages

[ References ]References