CVE-2026-61845 Details
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.
A denial-of-service vulnerability has been identified in the Crass Ruby library, specifically in versions prior to 1.0.7. The issue arises because Crass processes CSS scientific notation numbers by allowing unlimited exponentiation before capping the value at Float::MAX. This flaw can be exploited by sending carefully crafted CSS strings, leading to excessive CPU and memory usage during parsing. Such exploitation can cause applications to crash.
Users can upgrade to Crass version 1.0.7 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 30, 2026CISA-ADP
Assessed Oct 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/rgrove/crass/commit/ea6726b7f7cf7e85b23aa2240b8512b4f8d11ad9 | [email protected] | Source CodeVendor |
| https://github.com/rgrove/crass/releases/tag/v1.0.7 | [email protected] | Release NotesVendor |
| https://github.com/rgrove/crass/security/advisories/GHSA-6wmf-3r64-vcwv | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-789 | Memory Allocation with Excessive Size Value | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Crass | < 1.0.7 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 30, 2026 | CVE Modified | CISA-ADP |
| Oct 30, 2026 | New CVE Received | [email protected] |