Zero-Day Vulnerability

A zero-day vulnerability is an exploitable flaw in software that the developer or vendor doesn't yet know about — meaning there are 'zero days' of protection available. Once discovered by attackers, zero-days can be exploited before patches exist. High-profile zero-days in libraries like Log4j and frameworks like Spring have demonstrated how a single vulnerability can cascade across millions of applications. For teams using AI-generated code, zero-day risk is amplified because AI tools often pull in outdated dependencies and rarely configure automated vulnerability scanning. Without dependency monitoring tools like Dependabot, Snyk, or Renovate, your application can be running known-vulnerable packages for months without anyone noticing.