{"id":"EUVD-2026-28792","revision":null,"records":[{"revision":"87ee1356b1fd43f8827e06fe8f7fd57b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41690","aliases":[],"title":"Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters","description":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code  it can be chained into RCE.","state":0,"publishedAt":"2026-05-08T15:24:12.014+00:00","modifiedAt":"2026-05-08T16:43:48.281+00:00","affected":[{"ecosystem":"Vendor product","name":"i18next-http-middleware","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"i18next\",\n                    \"product\": \"i18next-http-middleware\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.9.3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-41690","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-41690","identifiers":["CVE-2026-41690"]},"retained":false,"historicalAffected":[]},{"revision":"8a99669a7c2e4c22a971fe71e0ff28d8","observedAt":"2026-11-06T00:46:11.519+00:00","statement":{"source":"euvd","id":"EUVD-2026-28792","aliases":["CVE-2026-41690"],"title":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting…","description":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code  it can be chained into RCE.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6,"severity":null}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28792","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 8, 2026, 3:24:12 PM","dateUpdated":"May 8, 2026, 4:43:48 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-28792","identifiers":["EUVD-2026-28792","CVE-2026-41690"]},"retained":false,"historicalAffected":[]},{"revision":"bc04804db80a43c382cf70d6563a27f8","observedAt":"2026-10-27T10:10:19.004+00:00","statement":{"source":"nvd","id":"CVE-2026-41690","aliases":[],"title":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting…","description":"18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code  it can be chained into RCE.","state":0,"publishedAt":"2026-05-08T16:16:11.473+00:00","modifiedAt":"2026-10-26T18:10:00.173+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":8.6,"severity":"HIGH"}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41690","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22","CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-05-08T16:16:11.473","lastModified":"2026-10-26T18:10:00.173"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41690","identifiers":["CVE-2026-41690"]},"retained":false,"historicalAffected":[]},{"revision":"5b4d59991c224f069bfbe7a40bb2e0aa","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-5fgg-jcpf-8jjw","aliases":["CVE-2026-41690"],"title":"i18next-http-middleware: Prototype pollution and path traversal via user-controlled language and namespace parameters","description":"### 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's public API:\n\n- `getResourcesHandler` — reads `lng`/`ns` from query parameters or route params and passes them unvalidated to:\n  - `utils.setPath(resources, [lng, ns], ...)` — 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, ...)` — 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 => i18next.options.ns.push(ns))` loop additionally performed permanent, unbounded growth of the shared singleton namespace list.\n- `missingKeyHandler` — 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** — a single unauthenticated request of the form `GET /locales/resources.json?lng=__proto__&ns=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** — 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** — 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`< 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 — 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.","state":0,"publishedAt":"2026-04-22T17:40:47+00:00","modifiedAt":"2026-05-13T13:56:02.081799+00:00","affected":[{"ecosystem":"npm","name":"i18next-http-middleware","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.9.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/i18next/i18next-http-middleware/security/advisories/GHSA-5fgg-jcpf-8jjw","https://nvd.nist.gov/vuln/detail/CVE-2026-41690","https://github.com/i18next/i18next-http-middleware","https://www.i18next.com/how-to/faq#how-should-the-language-codes-be-formatted"],"sourceUrl":"https://github.com/advisories/GHSA-5fgg-jcpf-8jjw","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-5fgg-jcpf-8jjw","identifiers":["GHSA-5fgg-jcpf-8jjw","CVE-2026-41690"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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