CVE-2026-116695

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{"bugzilla": {"description": "crass: crass: CSS injection via malformed URL token parsing", "id": "2562396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562396"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-436", "details": ["Crass is a Ruby CSS parser that is compliant with the CSS Syntax Level 3 specification. Prior to 1.0.8, Crass incorrectly treats a closing parenthesis after an escaped backslash as escaped while consuming the remnants of a bad URL. Crass therefore keeps declarations, style rules, or at-rules inside a bad URL token even though a browser treats them as live CSS. A sanitizer that parses untrusted CSS with Crass and reserializes it without rejecting the bad URL can allow CSS used for UI redress, external resource loading, or CSS-based data exfiltration, but this issue does not enable script execution in modern browsers. This issue is fixed in version 1.0.8.", "A flaw was found in Crass. When parsing malformed URL tokens containing escaped backslashes, Crass incorrectly treats the closing parenthesis as escaped, retaining style declarations that web browsers interpret as active Cascading Style Sheets (CSS). A remote attacker could supply crafted CSS to an application relying on Crass for sanitization, enabling unauthorized style injection that can lead to sensitive data exfiltration or user interface manipulation."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-116695", "package_state": [{"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp2/system-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp2/system-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "rubygem-crass", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-10-27T20:10:34Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-116695\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-116695\nhttps://github.com/rgrove/crass/commit/689fc45c632fdf3803b2f4e844ffc9cca3b08f34\nhttps://github.com/rgrove/crass/releases/tag/v1.0.8\nhttps://github.com/rgrove/crass/security/advisories/GHSA-pq4g-8rxf-4g29"], "statement": "This vulnerability is rated as having Moderate impact because successful exploitation relies on applications accepting untrusted style definitions and passing them through Crass for sanitization, resulting in unauthorized CSS injection rather than direct code or script execution. Because client-side browsers prevent arbitrary script execution from CSS alone, the blast radius is confined to presentation tampering and secondary data leakage via external resources.", "threat_severity": "Moderate"}

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