{"id":"CVE-2026-33943","revision":"5f76f9a9c5e84ce8889cec1641cc71dc","records":[{"revision":"5f76f9a9c5e84ce8889cec1641cc71dc","observedAt":"2026-10-25T08:17:29.602+00:00","statement":{"source":"nvd","id":"CVE-2026-33943","aliases":[],"title":"Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in `ECMAScriptModuleCompiler` allows an attacker to achieve Remote Code Execu…","description":"Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in `ECMAScriptModuleCompiler` allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside `export { }` declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.","state":0,"publishedAt":"2026-03-27T22:16:21.393+00:00","modifiedAt":"2026-07-15T02:20:26.543+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"},{"system":"CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3c","https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8","https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64","https://access.redhat.com/security/cve/CVE-2026-33943","https://bugzilla.redhat.com/show_bug.cgi?id=2452522","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33943.json"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33943","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-94","CWE-917"],"productCriteria":["cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-03-27T22:16:21.393","lastModified":"2026-07-15T02:20:26.543"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33943","identifiers":["CVE-2026-33943"]},"retained":false,"historicalAffected":[]}],"coverage":[]}