Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping 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, potentially resulting in a crash. This issue is fixed in version 1.0.7.
History

Sat, 31 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 31 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important


Fri, 30 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Rgrove
Rgrove crass
Vendors & Products Rgrove
Rgrove crass

Fri, 30 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
Description Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping 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, potentially resulting in a crash. This issue is fixed in version 1.0.7.
Title Crass: Large numeric exponents cause CPU and memory denial of service
Weaknesses CWE-789
References
Metrics cvssV4_0

{'score': 8.9, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-30T18:41:58.369Z

Updated: 2026-10-30T19:41:24.227Z

Reserved: 2026-07-10T20:28:17.513Z

Link: CVE-2026-61845

cve-icon Vulnrichment

Updated: 2026-10-30T19:40:47.021Z

cve-icon NVD

Status : Deferred

Published: 2026-10-30T19:18:28.197

Modified: 2026-10-30T20:17:11.263

Link: CVE-2026-61845

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-30T18:41:58Z

Links: CVE-2026-61845 - Bugzilla