CVE-2026-61848: DoS

Description

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.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

References

Other References

http://github.com/rgrove/crass/commit/da29664648bf80a97a6439e030a4814291c9afa5 https://github.com/rgrove/crass/releases/tag/v1.0.7 https://github.com/rgrove/crass/security/advisories/GHSA-8vfg-2r28-hvhj

Frequently Asked Questions

What is CVE-2026-61848? +

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.

How do I check if I'm vulnerable to CVE-2026-61848? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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