medium6.3
CVE-2026-61847
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | crass | < 1.0.7 | 1.0.7 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Rgrove | Crass | before 1.0.7 |