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[ CVE-2026-61848 · Published 30 Oct 2026 ]

Crass: Non-ASCII characters cause superlinear CPU consumption

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, when Crass parses input containing `non-ASCII characters`, inefficiencies in tracking the positions of `multi-byte characters` result in superlinear parsing time. An attacker-controlled CSS input consisting of many `non-ASCII characters` can therefore cause excessive CPU consumption and potentially denial of service. 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