{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "happy-dom",
          "vendor": "capricorn86",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 17.0.0, \u003c 21.0.4"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T21:32:24.999Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-834v-8h66-3h79",
        "discovery": "UNKNOWN"
      },
      "title": "Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-115895",
    "datePublished": "2026-10-23T21:32:24.999Z",
    "dateReserved": "2026-10-23T19:37:27.177Z",
    "dateUpdated": "2026-10-23T21:32:24.999Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}