Prompt Injection Defense Weekly

Defense Tip #1: Stop Prompt Injection with Per-Request Canary Delimiters

CVE-2026-26030 and CVE-2026-25592 showed prompt injection reaching RCE in Semantic Kernel. This week's defense: per-request HMAC-keyed canary separators that cut attack success rates by 2.3× — plus a copy-paste system prompt template you can ship today.