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[ CVE-2026-61845 · Published 30 Oct 2026 ]

Crass : Large numeric exponents cause CPU and memory denial of service

CVSS 8.9 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 converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, potentially resulting in a crash. 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