CVE-2026-61846

CVSS 6.3 (medium) · published 2026-10-30

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.

Weakness: CWE-674

Source: NVD CVE-2026-61846

References

• https://github.com/rgrove/crass/commit/cf68287356ec6e20d51cfc4a2d0c3912b7334e99
• https://github.com/rgrove/crass/releases/tag/v1.0.7
• https://github.com/rgrove/crass/security/advisories/GHSA-6jxj-px6v-747w

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