{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "i18next-http-middleware"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41690"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321",
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T17:40:47Z",
    "nvd_published_at": "2026-05-08T16:16:11Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nVersions of `i18next-http-middleware` prior to 3.9.3 pass user-controlled `lng` and `ns` parameters to two internal paths that use them in ways that enable prototype pollution and, depending on the configured backend, path traversal or SSRF.\n\nThe vulnerable entry points are unauthenticated HTTP handlers that are part of the middleware\u0027s public API:\n\n- `getResourcesHandler` \u2014 reads `lng`/`ns` from query parameters or route params and passes them unvalidated to:\n  - `utils.setPath(resources, [lng, ns], ...)` \u2014 the `setPath` helper did not guard against `__proto__`, `constructor`, or `prototype` keys, writing into `Object.prototype` when those values were supplied.\n  - `i18next.services.backendConnector.load(languages, namespaces, ...)` \u2014 depending on the configured backend, unvalidated path segments enabled filesystem path traversal (e.g. with `i18next-fs-backend`) or SSRF (e.g. with `i18next-http-backend`).\n  - A `namespaces.forEach(ns =\u003e i18next.options.ns.push(ns))` loop additionally performed permanent, unbounded growth of the shared singleton namespace list.\n- `missingKeyHandler` \u2014 iterated the incoming request body with `for...in`, which traverses inherited prototype-chain properties. A POST body like `{\"__proto__\": {\"isAdmin\": true}}` was forwarded into `saveMissing`.\n\n### Impact\n\n- **Prototype pollution** \u2014 a single unauthenticated request of the form `GET /locales/resources.json?lng=__proto__\u0026ns=isAdmin` writes into `Object.prototype`, affecting every plain object created subsequently in the Node.js process. This can break authorization checks (`if (user.isAdmin)`), cause denial of service via type confusion, or be chained into RCE depending on what downstream code reads from polluted objects.\n- **Path traversal / SSRF** \u2014 with filesystem or HTTP backends that interpolate `lng`/`ns` into paths or URLs, attacker-controlled values like `ns=../../etc/passwd` or `lng=internal-service` could reach resources outside the intended scope.\n- **Denial of service** \u2014 the unbounded `i18next.options.ns` growth, plus repeated backend load calls, enabled memory and CPU exhaustion from unique namespace payloads.\n\n### Affected versions\n\n`\u003c 3.9.3`.\n\n### Patch\n\nFixed in **3.9.3**. The patch:\n\n1. Blocks `__proto__`, `constructor`, and `prototype` keys in `utils.setPath`.\n2. Replaces the `for...in` body iteration in `missingKeyHandler` with `Object.keys()` plus an explicit dangerous-keys guard.\n3. Introduces a `utils.isSafeIdentifier` helper (denylist approach \u2014 still permits any legitimate i18next language code shape) that filters `lng`/`ns` values for path-traversal, path separators, control characters, prototype keys, and over-long inputs before they reach the backend connector and before they are pushed into `i18next.options.ns`.\n\n### Workarounds\n\nNo workaround short of upgrading. Front-proxying the middleware with a WAF rule that rejects requests containing `__proto__`, `constructor`, `prototype`, `..`, or control characters in `lng`/`ns` query parameters or body keys is a partial mitigation.\n\n### Credits\n\nDiscovered via an internal security audit of the i18next ecosystem.",
  "id": "GHSA-5fgg-jcpf-8jjw",
  "modified": "2026-05-13T13:29:51Z",
  "published": "2026-04-22T17:40:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41690"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/i18next/i18next-http-middleware"
    },
    {
      "type": "WEB",
      "url": "https://www.i18next.com/how-to/faq#how-should-the-language-codes-be-formatted"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "i18next-http-middleware: Prototype pollution and path traversal via user-controlled language and namespace parameters"
}