On a quiet Tuesday afternoon, our telemetry alerts flagged anomalies in resource request logs. A newly disclosed security vulnerability in Next.js server-side parsing opened the door to execution threats on live nodes. With a fleet of over 150 client applications deployed on our shared infrastructure, the stakes were high.
Our immediate goal was clear: isolate the threat vector, verify package versions, and deploy a secure patch without causing downtime across the domains. The vulnerability targeted input query parsing during Server Side Rendering (SSR).
Within 12 hours, we co-analyzed the execution payloads, traced them to request endpoints, and formulated a dependency upgrade schedule. Working directly on the server fleet, we script-patched Next.js packages to a hardened release.
To prevent recurrence, we authored Linux automation shell scripts to audit active PM2 directories, update system permissions, and tighten Nginx reverse-proxy ingress headers. The entire response took under 48 hours, maintaining 99% fleet availability.