{"id":"CVE-2026-115895","revision":"56ec99e3e8c246968f879544864b903a","records":[{"revision":"56ec99e3e8c246968f879544864b903a","observedAt":"2026-10-23T22:48:20.692+00:00","statement":{"source":"cve-program","id":"CVE-2026-115895","aliases":[],"title":"Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution","description":"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.","state":0,"publishedAt":"2026-10-23T21:32:24.999+00:00","modifiedAt":"2026-10-23T21:32:24.999+00:00","affected":[{"ecosystem":"Vendor product","name":"happy-dom","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"capricorn86\",\n                    \"product\": \"happy-dom\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 17.0.0, < 21.0.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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/security/advisories/GHSA-834v-8h66-3h79","https://github.com/capricorn86/happy-dom/pull/2537","https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13","https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115895","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115895","identifiers":["CVE-2026-115895"]},"retained":false,"historicalAffected":[]}],"coverage":[]}