CVE-2026-61846
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability—
ProductCrass
PublishedOct 30, 2026
First seenNov 4, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- crass1.0.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| crassRubyGems | v < 1.0.7 | 1.0.7 |
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