{"schemaVersion":3,"id":"CVE-2025-30218","aliases":["GHSA-223j-4rm8-mrmf"],"status":"published","duplicateOf":null,"title":null,"description":"Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. 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