CVE-2026-61847
Crass: A large number of adjacent CSS comments can trigger a SystemStackError
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-674 |
| Vendor | rgrove |
| Product | crass |
| Published | Oct 30, 2026 |
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Affected Versions
rgrove / crass
< 1.0.7