{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-115895", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-23T19:37:27.177Z", "datePublished": "2026-10-23T21:32:24.999Z", "dateUpdated": "2026-10-23T21:32:24.999Z"}, "containers": {"cna": {"title": "Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution", "problemTypes": [{"descriptions": [{"cweId": "CWE-94", "lang": "en", "description": "CWE-94: Improper Control of Generation of Code ('Code Injection')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-834v-8h66-3h79", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-834v-8h66-3h79"}, {"name": "https://github.com/capricorn86/happy-dom/pull/2537", "tags": ["x_refsource_MISC"], "url": "https://github.com/capricorn86/happy-dom/pull/2537"}, {"name": "https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13", "tags": ["x_refsource_MISC"], "url": "https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13"}, {"name": "https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4"}], "affected": [{"vendor": "capricorn86", "product": "happy-dom", "versions": [{"version": ">= 17.0.0, < 21.0.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-23T21:32:24.999Z"}, "descriptions": [{"lang": "en", "value": "Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. From 17.0.0 until 21.0.4, packages/happy-dom/src/module/ECMAScriptModuleCompiler.ts accepts a named ESM import alias without validating that it is a JavaScript binding identifier before inserting it into a generated destructuring binding. With enableJavaScriptEvaluation enabled, attacker-controlled HTML or module source can use an invalid alias that becomes a valid default initializer after compilation, causing the generated JavaScript to execute in the Node.js host process. The demonstrated reachable path uses a JSON module import attribute, which prevents the malicious alias from being emitted again in a later ESM circular-import assignment and keeps the generated function syntactically valid. This incomplete fix for CVE-2026-33943 is a distinct residual path because the earlier remediation validated the local export importName path but not the named-import alias. This issue is fixed in version 21.0.4."}], "source": {"advisory": "GHSA-834v-8h66-3h79", "discovery": "UNKNOWN"}}}}

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