要点
- CVE-2026-61847 は crass に影響する深刻度「中」 (CVSS 6.3) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.49%（全脆弱性の 41.8% より高い）。
- 対処：1.0.7 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| crass RubyGems | < 1.0.7
| 1.0.7
|
概要
Impact
When the :preserve_comments option is not enabled (which is the default behavior), Crass discards CSS comments by recursively consuming the next token. An attacker who provides a stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a SystemStackError.
Patches
This is fixed in Crass 1.0.7, which no longer recurses when discarding comments.
Workarounds
Set the :preserve_comments option to true if this is acceptable to your use case (recursion doesn't occur when comments are preserved).
NVD の説明
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.
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