# Hottest cybersecurity open-source tools of the month: May 2026 > Source: > Published: 2026-05-28 05:00:55+00:00 Presented here is a curated selection of noteworthy open-source cybersecurity solutions that have drawn recognition for their ability to enhance security postures across diverse settings. Pipelock: Open-source AI agent firewall AI coding agents run with shell access, environment variables containing API keys, and unrestricted internet connectivity, creating a single point of failure where one compromised tool call can leak credentials to an attacker-controlled domain. Pipelock, an open-source security harness developed by Joshua Waldrep under the … [More ](https://www.helpnetsecurity.com/2026/05/28/hottest-cybersecurity-open-source-tools-of-the-month-may-2026/) The post [Hottest cybersecurity open-source tools of the month: May 2026](https://www.helpnetsecurity.com/2026/05/28/hottest-cybersecurity-open-source-tools-of-the-month-may-2026/) appeared first on [Help Net Security](https://www.helpnetsecurity.com).