CVE-2026-61846

Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage

Published Oct 30, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Description
Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass recursively parses `CSS simple blocks and functions` without a depth guard. An attacker-controlled CSS value containing deeply nested blocks or functions can recurse until Ruby raises `SystemStackError`: stack level too deep, or cause excessive memory usage. Version 1.0.7 adds a configurable depth limit with a conservative default. This issue is fixed in version 1.0.7.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-6jxj-px6v-747w Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate

Type Values Removed Values Added
First Time appeared Rgrove
Rgrove crass
Vendors & Products Rgrove
Rgrove crass
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 recursively parses `CSS simple blocks and functions` without a depth guard. An attacker-controlled CSS value containing deeply nested blocks or functions can recurse until Ruby raises `SystemStackError`: stack level too deep, or cause excessive memory usage. Version 1.0.7 adds a configurable depth limit with a conservative default. This issue is fixed in version 1.0.7.
Title Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage
Weaknesses CWE-674
References
Metrics cvssV4_0

{'score': 6.3, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 5, 2026, 2:28 AM
Reserved
Jul 10, 2026, 8:28 PM
Status
Deferred
Published
Oct 30, 2026, 7:18 PM
Modified
Nov 5, 2026, 3:17 AM
Severity
Moderate
Public date
Oct 30, 2026, 6:43 PM