CVE-2026-41238

{"id": "CVE-2026-41238", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 4.7, "exploitabilityScore": 1.6}]}, "published": "2026-04-23T16:16:26.420", "references": [{"url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.0", "source": "security-advisories@github.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp", "source": "security-advisories@github.com"}, {"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-1321"}]}], "descriptions": [{"lang": "en", "value": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes \u2014 including event handlers \u2014 through sanitization. Version 3.4.0 fixes the issue."}], "lastModified": "2026-04-23T18:16:29.073", "sourceIdentifier": "security-advisories@github.com"}