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HighFix available

Crass : Large numeric exponents cause CPU and memory denial of service

Type: advisorySources: OSV

### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to `Float::MAX`. Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml

Products
crass
Affected versions
0.0.1, 0.0.2, 0.1.0, 0.2.0, 0.2.1, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6
Fixed versions
1.0.7
CVEs
CVE-2026-61845
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 13:03 UTC · Revision 1

Source evidence

Crass : Large numeric exponents cause CPU and memory denial of service

core-osv · Original source

Published 20 Oct 2026, 14:32 UTC

### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to `Float::MAX`. Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml

osv:GHSA-6wmf-3r64-vcwv

crass

Fixed versions: 1.0.7

Complete source record
{
  "id": "05636b532ffa8794f38fa188751e7a798a0a95056735bb8900ad78c23aa88ca8",
  "url": "https://osv.dev/vulnerability/GHSA-6wmf-3r64-vcwv",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Crass : Large numeric exponents cause CPU and memory denial of service",
    "summary": "### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to `Float::MAX`. Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml",
    "evidence": "osv:GHSA-6wmf-3r64-vcwv",
    "products": [
      {
        "name": {
          "value": "crass",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.0.7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "0.0.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.1.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.2.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.2.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.6",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-6wmf-3r64-vcwv",
      "aliases": [
        "CVE-2026-61845",
        "GHSA-6wmf-3r64-vcwv"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.0.7"
                }
              ]
            }
          ],
          "package": {
            "name": "crass",
            "purl": "pkg:gem/crass",
            "ecosystem": "RubyGems"
          },
          "versions": [
            "0.0.1",
            "0.0.2",
            "0.1.0",
            "0.2.0",
            "0.2.1",
            "1.0.0",
            "1.0.1",
            "1.0.2",
            "1.0.3",
            "1.0.4",
            "1.0.5",
            "1.0.6"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6wmf-3r64-vcwv/GHSA-6wmf-3r64-vcwv.json"
          }
        }
      ],
      "modified": "2026-10-20T14:45:03.938633122Z",
      "provider": "osv",
      "references": [
        "https://github.com/rgrove/crass/security/advisories/GHSA-6wmf-3r64-vcwv",
        "https://github.com/rgrove/crass",
        "https://github.com/rgrove/crass/releases/tag/v1.0.7",
        "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml",
        "https://rubygems.org/gems/crass/versions/1.0.7"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-674"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": null,
        "github_reviewed_at": "2026-10-20T14:32:39Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-61845",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 389733,
  "published_at": "2026-10-20T14:32:39+00:00"
}