| Validate server reference IDs during manifest lookup. | |
| Security context: https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp | |
| Only IDs matching the framework's generated server-reference format should be eligible for manifest lookup. Reject malformed IDs, including JavaScript object reflection or prototype property names, as invalid input rather than interpreting them as manifest properties or allowing generic type errors. Continue to resolve valid IDs normally, and distinguish a well-formed ID that is absent from the current manifest as a missing Server Action rather than a format error. | |
| Apply this consistently to fetch actions, multipart/form action descriptors, and applications that contain no Server Actions. Preserve the existing action-not-found HTTP behavior. Runtime diagnostics should semantically identify malformed IDs as format errors and plausible but absent IDs as missing actions. | |