Help Net Security newsletters: Daily and weekly news, cybersecurity jobs, open source projects, breaking news – subscribe here!

Please turn on your JavaScript for this page to function normally.
open-source cybersecurity tools
20 open-source cybersecurity tools to keep your team ready for anything

AI is changing how security teams find vulnerabilities, analyze code, test applications, and protect infrastructure. Developers are building tools to secure AI systems …

OpenSSH
OpenSSH 10.4 arrives with security fixes and a post-quantum signature option

Operators who manage remote access to Unix and Linux systems keep a close watch on OpenSSH, the software that carries most SSH traffic across the internet. The project …

Omnigent
Omnigent: Open-source AI agent framework and meta-harness

Plenty of developers now keep several coding agents close at hand, reaching for Claude Code on one task and Codex or Cursor on the next. Each tool arrives with its own command …

ClamAV
New ClamAV security patch closes seven scanner bugs dating back two decades

Open source antivirus scanning sits inside mail gateways, file upload checks, and endpoint tooling at organizations of every size. Much of that work runs through ClamAV, the …

Nika
Nika: Open-source code analysis tool

Many serious security bugs in web applications sit across several files at once. Request data enters through a controller, moves through data objects and service layers, and …

open-source cybersecurity tools
Hottest cybersecurity open-source tools of the month: June 2026

Presented here is a curated selection of noteworthy open-source cybersecurity solutions that have drawn recognition for their ability to enhance security postures across …

DarkMoon
DarkMoon: Open-source AI pentesting platform

Penetration testing has long run on expert time, with specialists spending days probing a network or web application by hand. Manual engagements stretch across weeks, expert …

Praxen
Praxen: Open-source AI agent behavior verification

Praxen is an open-source tool with a simple job: it checks whether an AI agent does what it claims to do. The tool takes an agent’s declared policy, looks at how the …

Agent Beacon
Agent Beacon: Open-source telemetry layer for AI agents

AI coding agents such as Claude Code, Codex CLI, Cursor, and Claude Cowork run on developer laptops, CI jobs, cloud environments, where they edit files, run commands, and call …

systemd
The systemd 261 release brings a software TPM, new OS installer

Linux distributions that ship systemd as their init system now have a new version to track. The systemd 261 update adds a cloud metadata subsystem, carries process state …

Homebrew
Homebrew tightens tap security, begins work on its interface

Anyone who installs software through a third-party Homebrew tap runs Ruby code written by people outside the project, and that code runs without a sandbox. That risk sits at …

Microsoft AntiSSRF
Microsoft AntiSSRF open-source library helps block server-side request forgery

AntiSSRF is an open-source code library from Microsoft that validates URLs and network connections to reduce server-side request forgery (SSRF) risks in web applications. It …

Don't miss

Cybersecurity news
Daily newsletter sent Monday-Friday
Weekly newsletter sent on Mondays
Editor's choice newsletter sent twice a month
Periodical newsletter released for important security events and breaking news
Weekly newsletter listing new cybersecurity job positions
Monthly newsletter focusing on open source cybersecurity tools