{"id":"CVE-2026-33943","sourceIdentifier":"security-advisories@github.com","published":"2026-03-27T22:16:21.393","lastModified":"2026-10-26T00:10:00.150","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"Happy DOM es una implementación de JavaScript de un navegador web sin su interfaz gráfica de usuario. En las versiones 15.10.0 a la 20.8.7, una vulnerabilidad de inyección de código en “ECMAScriptModuleCompiler” permite a un atacante lograr Ejecución Remota de Código (RCE) inyectando expresiones JavaScript arbitrarias dentro de las declaraciones “export { }” en scripts de módulo ES procesados por happy-dom. El compilador interpola directamente contenido no sanitizado en el código generado como una expresión ejecutable, y el filtro de comillas no elimina los backticks, lo que permite que las cargas útiles basadas en literales de plantilla eludan la sanitización. La versión 20.8.8 corrige el problema."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"capricorn86","product":"happy-dom","versions":[{"version":">= 15.10.0, < 20.8.8","status":"affected"}]}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","affectedData":[{"vendor":"Red Hat","product":"Red Hat Ansible Automation Platform 2","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"ansible-automation-platform-26/gateway-rhel9","cpes":["cpe:/a:redhat:ansible_automation_platform:2"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift4/ose-agent-installer-ui-rhel9","cpes":["cpe:/a:redhat:openshift:4"]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-03-27T21:58:00.418466Z","id":"CVE-2026-33943","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-94"}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","description":[{"lang":"en","value":"CWE-917"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:*","versionStartIncluding":"15.10.0","versionEndExcluding":"20.8.8","matchCriteriaId":"7EAF0355-096E-4A40-8520-8FA8EBEF230B"}]}]}],"references":[{"url":"https://github.com/capricorn86/happy-dom/commit/5437fdf8f13adb9590f9f52616d9f69c3ee8db3c","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/capricorn86/happy-dom/releases/tag/v20.8.8","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-33943","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2452522","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://github.com/capricorn86/happy-dom/security/advisories/GHSA-6q6h-j7hj-3r64","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33943.json","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}]}