CVE-2026-61847
Medium
Description
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when the `:preserve_comments` option is not enabled, which is the default, Crass discards CSS comments by recursively consuming the next token. An attacker-provided stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a `SystemStackError`, denying service to the parsing application. Preserving comments avoids this recursive path. 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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