Prompt Injection Defense Weekly

Week 1: The Lethal Trifecta — How 2026's Worst Prompt Injection Chains Work and How to Break Them

Three production-breaking prompt injection vectors from May–June 2026 — EchoLeak (CVE-2025-32711), Cymulate's zero-click RCE chain (CVE-2026-10591), and context-aware agent attacks — plus four defense prompt templates you can ship today: structural input separation, task-level invariants, trust-tier framing, and file-write scope restriction.