CVE-2026-41690 Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters

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...

Server-side Request Forgery (SSRF)

Overview i18next-http-middleware is an i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the lng and ns parameters used by...

GHSA-5FGG-JCPF-8JJW i18next-http-middleware: Prototype pollution and path traversal via user-controlled language and namespace parameters

Summary Versions 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. The vulnerable entry points are unauthenticated HTTP...