Allocation of Resources Without Limits or Throttling

Summary

Next.js is a React framework for building full-stack web applications. In versions 15.0.0 prior to 15.5.16 and 16.0.0 prior to 16.2.5, applications using Partial Prerendering through the Cache Components feature can be vulnerable to connection exhaustion through crafted POST requests to a server action. In affected configurations, a malicious request can trigger a request-body handling deadlock that leaves connections open for an extended period, consuming file descriptors and server capacity until legitimate users are denied service. This vulnerability is fixed in 15.5.16 and 16.2.5.