Best Free Vulnerability Scanning Tools in 2026

Cybersecurity and malware protection

4.6/5 on G2 · 1,089 ratings, Sep 2026

Malwarebytes protects against malware and online threats. Remediation for infections, real-time protection, and ransomware defense-security software with strong remediation. The malware removal is effective. The protection is solid. The reputation is established. Users dealing with malware or wanting protection choose Malwarebytes for effective security.

Continuous vulnerability management to stop breaches before they start

4.8/5 on G2 · 219 ratings, Sep 2026

Intruder is a comprehensive cybersecurity platform that helps organizations stop breaches before they start by providing continuous vulnerability management, attack surface monitoring, and cloud security posture management. It combines automated scanning with risk-based prioritization to cut through alert fatigue, enabling teams to focus on the most critical issues. The platform covers external and internal infrastructure, web applications, APIs, container images, and cloud environments across AWS, Azure, and Google Cloud. Key capabilities include automated asset discovery to reveal shadow IT, daily cloud configuration checks, emerging threat detection, and a virtual security analyst named GregAI that helps teams work smarter. Intruder integrates with popular tools like Slack, Jira, GitHub, and ServiceNow, and supports compliance with standards such as SOC 2, ISO 27001, and HIPAA. With a large customer base worldwide, Intruder is designed for lean, time-strapped security teams that need to demonstrate progress and maintain cyber hygiene.

Open-source security monitoring

4.5/5 on G2 · 71 ratings, Aug 2026

Wazuh provides open-source security monitoring. SIEM, threat detection, and compliance-enterprise security without enterprise cost. The open-source model is powerful. The features are comprehensive. The community is active. Organizations wanting open-source security platform choose Wazuh for free SIEM.

Static vulnerability analysis for containers

4.3/5 on SourceForge · 67 ratings, May 2026

Clair scans container images for vulnerabilities before you deploy them. Feed it an image, get back a list of known CVEs in the packages it contains-security visibility into what you're running. Integration into registries enables automatic scanning. The vulnerability database updates continuously. API access enables custom workflows. Container security starts with knowing what vulnerabilities exist. Clair provides that visibility for organizations running containerized workloads.

AI-powered appsec that finds real risk and fixes flaws

Corgea is an AI-native application security platform that understands your code, business logic, and infrastructure to find real risk without noise. It provides a unified control plane for security scanning, replacing fragmented tools with one platform teams can run daily. The platform offers AI-powered static analysis (SAST), dependency scanning, secrets scanning, container scanning, and IaC scanning, all integrated into developer workflows via SCM, IDE, and agent integrations. Corgea's AI SAST detects business logic flaws like broken authentication and authorization gaps that traditional scanners miss, and delivers review-ready fixes with high accuracy. The platform also includes an AI penetration testing product that uses hundreds of attack agents to simulate real-world attacks, producing auditor-ready reports in a short timeframe. Designed for security teams and developers, Corgea aims to reduce false positives, prioritize exploitable risks, and speed up remediation without the developer tax.

External port and vulnerability scans from your terminal

qsa.sh is a tool that performs an external port and vulnerability scan of your own public IP address, executed directly from your terminal with a single curl command. It uses open-source industry-standard tools, naabu for port discovery, nmap with the vulners script for service and CVE fingerprinting, and nuclei for exposure checks, all running from remote scanner nodes to give you an outside-in view of your host's internet-facing security posture. Scans are streamed live to your terminal, results are ephemeral (never stored), and the process is transparent: you see exactly what tools are run and can inspect the output in real time. The product is designed with strict safety constraints: it only scans the IP address from which the request originates, and it refuses to scan known CGNAT, mobile-carrier, proxy, VPN, or Tor addresses, as well as IPv6 origins. Each scan begins with a 15-second warning window during which you can abort, serving as a consent gate. Three tiers are available: a free tier scanning the top 1,000 TCP ports with a curated set of nuclei checks, a Full subscription requiring a paid plan covering all 65,535 ports with async delivery, and a Deep one-time scan for a set fee that runs the full nuclei template set and emails the report. Paid access uses one-time tokens without requiring an account.

Your AI teammate for security, identifying real vulnerabilities and empowering developers.

Hacktron is an AI-powered security platform designed to help development teams identify and fix exploitable vulnerabilities with the speed and accuracy of a penetration tester. It integrates into existing workflows to provide deep security analysis, moving beyond generic alerts to focus on real, actionable threats. The platform offers full-scope security assessments, including penetration testing and code reviews, capable of generating audit-ready reports for compliance standards like SOC 2 and ISO 27001 in hours rather than weeks. It's built by experienced security researchers and competitive hackers, leveraging AI agents to perform exploit-driven validation and threat modeling across complex applications, multiple services, and integrations. Hacktron is ideal for engineering teams shipping new features rapidly who need to ensure robust security without sacrificing development velocity.

Comprehensive security monitoring and vulnerability scanning for your digital assets.

Cotool Security offers a suite of tools designed to enhance the security posture of organizations by providing continuous monitoring and proactive vulnerability management. It aims to identify and address security weaknesses across various digital assets, including web applications, networks, and cloud infrastructure. The platform is typically geared towards small to medium-sized businesses, developers, and IT security professionals who need an accessible yet robust solution to manage their cybersecurity risks. By automating the detection of vulnerabilities and offering insights into potential threats, Cotool Security helps users maintain compliance and protect sensitive data without requiring extensive in-house security expertise.

Scan AI-built apps for security flaws and get fix prompts for your coding tool

Epherem is a free security scanner designed specifically for applications built with AI coding tools like Lovable, Bolt, Cursor, and similar platforms. It performs static analysis on your project's code, configuration files, and dependencies to identify common security mistakes that AI-generated code often leaves behind. With 55 targeted checks, it looks for exposed keys, open database tables, missing authentication and authorization checks, unsafe input handling, and SQL injection vulnerabilities. It also cross-references your exact package versions against published advisories from the OSV database. Epherem is built for the person who created the app, not a security expert. Every finding is explained in plain language: what's wrong, what an attacker could do with it, and how to fix it. Each issue includes a ready-to-use prompt that you can paste into your AI tool (such as Cursor, Lovable, or Claude Code) to automatically generate the code change. The scanner is honest about its limitations: it never runs your app, it doesn't see settings in external dashboards, and it clearly marks findings that need human verification. Coverage is strongest for JavaScript and TypeScript, with partial support for Python. After each scan, your code is deleted, and only your report remains in your account until you delete it.

Scan vibe-coded apps for risks from a live URL or public GitHub repo

LeakCheck is a read-only scanner for vibe-coded apps. Paste a live URL or public GitHub repo and get a risk score plus finding titles. First scan needs no account. LeakCheck Pro offers paid tiers, keeps watching apps after you ship and alerts when something gets worse.