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open-source cybersecurity tools
Hottest cybersecurity open-source tools of the month: May 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 …

Vigolium
Vigolium: Open-source vulnerability scanner

Vigolium, an open-source vulnerability scanner that combines deterministic scanning with AI-driven auditing, launched its initial open-source release this month. The project …

Proton Pass
Proton Pass adds monitored credential sharing for AI agents

Proton Pass, a secure, end-to-end encrypted password manager, added credential sharing through AI access tokens, allowing users to give AI agents access to selected items and …

CVE Lite CLI
CVE Lite CLI: Open-source dependency vulnerability scanner

Dependency vulnerability scanning in JavaScript and TypeScript projects has long sat at the end of the development pipeline. Pull requests get opened, continuous integration …

Lyrie
Lyrie: Open-source autonomous pentesting agent

Penetration testing has usually required weeks of manual work, specialized tooling, and teams with narrow skill sets. Lyrie, an open-source autonomous security agent built by …

Incognito Chat Meta AI
WhatsApp adds Incognito Chat for private Meta AI conversations

The company launched Incognito Chat with Meta AI, a feature that lets users hold AI conversations the platform itself cannot read. The rollout will reach WhatsApp and the …

Sandyaa
Sandyaa: Open-source autonomous security bug hunter

Source code auditing has traditionally relied on static analyzers that flag long lists of potential issues, leaving engineers to sort bugs from noise. A new open-source …

dnsmasq
Six new dnsmasq vulnerabilities open the door to DNS cache poisoning, local root

Recent disclosures have revealed that open-source networking tool dnsmasq is grappling with a serious set of vulnerabilities. The problems span memory safety and input …

HEIDI
HEIDI: Free IDE security plugin for open-source vulnerability checks

Open-source dependencies make up a large percentage of the code in production applications, and most vulnerability checks still run late in the pipeline, inside CI/CD systems …

NetGuard
Product showcase: NetGuard open-source firewall for Android

NetGuard is a free, open-source firewall for Android phones and tablets that provides users with a simple way to block internet access. Android does not allow VPN services to …

MCP Python Hooks
Open-source MCP server monitoring for Python apps

Pythonic Model Context Protocol servers handle tool calls, session events, module imports, and subprocess activity. BlueRock has released MCP Python Hooks, an open source …

AIMap
AIMap: Open-source tool finds and tests exposed AI endpoints

Public-facing Ollama servers, MCP endpoints, and inference proxies have multiplied across the internet over the past year, often deployed without authentication or rate …

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