Hottest Cybersecurity Open-Source Tools of the Month: June 2026
Help Net Security, Tuesday, June 30th, 2026
A curated roundup of seven open-source cybersecurity tools from June 2026, heavily focused on AI agent security.
This curated collection highlights seven notable open-source cybersecurity tools released in June 2026, with a strong focus on the emerging area of AI agent security.
Featured tools include OWASP Agent Memory Guard, a runtime defense against memory-based attacks, and Agent Threat Rules, an open detection format for prompt injection, tool poisoning, and credential theft.
AgentGG is an Apache 2.0 static analysis scanner that uses AI agents to confirm findings, while DockSec combines container scanning with AI-powered remediation for Docker files. Agent Beacon provides telemetry for monitoring AI coding agent activity, Praxen verifies whether agents follow declared policies, and DarkMoon automates end-to-end penetration testing.