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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 6.3 · rgroveNVD modified 2026-10-30 18:43
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 3
- https://github.com/rgrove/crass/security/advisories/GHSA-6jxj-px6v-747w x_refsource_confirm
- https://github.com/rgrove/crass/commit/cf68287356ec6e20d51cfc4a2d0c3912b7334e99 x_refsource_misc
- https://github.com/rgrove/crass/releases/tag/v1.0.7 x_refsource_misc