---
id: CVE-2026-61848
title: 'Crass: Non-ASCII characters cause superlinear CPU consumption'
summary: >-
  Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3
  specification. Prior to 1.0.7, when Crass parses input containing `non-ASCII
  characters`, inefficiencies in tracking the positions of `multi-byte
  characters` r…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L'
cvssSource: cna
cwe:
  - CWE-400
vendor: rgrove
product: crass
affected:
  - crass < 1.0.7
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T18:45:20.036Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-61848'
references:
  - url: 'https://github.com/rgrove/crass/security/advisories/GHSA-8vfg-2r28-hvhj'
    label: 'https://github.com/rgrove/crass/security/advisories/GHSA-8vfg-2r28-hvhj'
  - url: 'https://github.com/rgrove/crass/releases/tag/v1.0.7'
    label: 'https://github.com/rgrove/crass/releases/tag/v1.0.7'
  - url: >-
      http://github.com/rgrove/crass/commit/da29664648bf80a97a6439e030a4814291c9afa5
    label: >-
      http://github.com/rgrove/crass/commit/da29664648bf80a97a6439e030a4814291c9afa5
  - url: 'https://github.com/advisories/GHSA-8vfg-2r28-hvhj'
tags:
  - cve.org
  - ghsa
  - rubygems
epss: 0.00486
epssPercentile: 0.41938
aliases:
  - GHSA-8vfg-2r28-hvhj
ecosystem: rubygems
patched:
  - crass 1.0.7
ingestedAt: '2026-10-29T16:38:25.970Z'
---

## Overview

Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when Crass parses input containing `non-ASCII characters`, inefficiencies in tracking the positions of `multi-byte characters` result in superlinear parsing time. An attacker-controlled CSS input consisting of many `non-ASCII characters` can therefore cause excessive CPU consumption and potentially denial of service. This issue is fixed in version 1.0.7.

## Affected

- `crass < 1.0.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-61848)

Affected packages:

- `crass < 1.0.7`

Patched in:

- `crass 1.0.7`

Source: https://github.com/advisories/GHSA-8vfg-2r28-hvhj