{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "fd163520b74d9fa146be91f7b4e4f46d6cccbe13"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v21.0.4",
                "range": [
                  {
                    "fixed": "fd163520b74d9fa146be91f7b4e4f46d6cccbe13"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fd163520b74d9fa146be91f7b4e4f46d6cccbe13"
            }
          ],
          "repo": "https://github.com/capricorn86/happy-dom",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-834v-8h66-3h79"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115895.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "range": [
              {
                "introduced": "17.0.0"
              },
              {
                "fixed": "21.0.4"
              }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
          }
        ]
      },
      {
        "extracted_events": [
          {
            "range": [
              {
                "fixed": "21.0.4"
              }
            ],
            "source": "DESCRIPTION"
          }
        ]
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-115895",
  "modified": "2026-10-25T02:30:40.244321217Z",
  "published": "2026-10-23T21:32:24.999Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/capricorn86/happy-dom/releases/tag/v21.0.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115895.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/capricorn86/happy-dom/security/advisories/GHSA-834v-8h66-3h79"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115895"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capricorn86/happy-dom/commit/fd163520b74d9fa146be91f7b4e4f46d6cccbe13"
    },
    {
      "type": "FIX",
      "url": "https://github.com/capricorn86/happy-dom/pull/2537"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Happy DOM: Incomplete fix for CVE-2026-33943: unsanitized import alias leads to host code execution"
}