# CVE-2026-61847: ruby-crass: Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification

CVE-2026-61847 is fixed in ruby-crass on 1 platform by DEBIAN-CVE-2026-61847 (version 1.0.7-1), released October 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-61847
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 30, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-crass Debian 14 | 1.0.7-1 | [DEBIAN-CVE-2026-61847](https://patchblox.com/security/data/fix/linux/debian-cve-2026-61847.md) | Oct 31, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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