GHSA-4633-3J49-MH5Q Next.js: Cache confusion of response bodies for requests with bodies containing invalid UTF-8 byte sequences

Impact A server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This is only an issu...