GHSA-mg66-mrh9-m8jx Next.js vulnerable to Denial of Service via connection exhaustion in applications using Cache Components

• npm next: >= 15.0.0, < 15.5.16 → fixed in 15.5.16 • npm next: >= 16.0.0, < 16.2.5 → fixed in 16.2.5

Impact 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. Fix We now treat the header used for resuming Partial Prerendered requests as an internal-only header and strip it from untrusted incoming requests. This header should never be accepted directly from external clients. Workarounds If you cannot upgrade immediately, block requests that would be handled by Next.js if they contain the `Next-Resume` header at the edge.