Zero-Day Vulnerability Report July 2026

Zero-day vulnerabilities give security teams almost no warning, and that gap is widening as AI and LLM-powered applications enter production. This report covers 323 zero-day vulnerabilities disclosed in July 2026, spanning traditional web application flaws and emerging Agentic AI and LLM risks such as prompt injection, insecure tool invocation, and RAG data exposure. AppTrana's default rule set blocked every one of them, delivering 100% coverage without requiring custom rule updates.