Semgrep

Overview

Semgrep is a fast, open-source static analysis tool that helps developers and security teams find and fix security vulnerabilities, enforce code standards, and prevent bugs. Unlike traditional linters or SAST tools, Semgrep uses a pattern-matching engine that works across multiple programming languages without requiring a full parser. This allows for highly customizable and accurate rules that can be written with a simple syntax. Semgrep can be run locally, in CI/CD pipelines, or as a managed service with the Semgrep AppSec Platform.

Key Features

• Pattern-Based Scanning: Semgrep scans code using user-defined patterns that look like the code itself, making it accessible and easy to write custom rules.
• Multi-Language Support: Supports over 20 languages including Python, JavaScript, Java, Go, Ruby, TypeScript, and more.
• CI/CD Integration: Integrates natively with GitHub Actions, GitLab CI, Jenkins, CircleCI, and other CI/CD platforms for automated scanning.
• Supply Chain Security: Detects known vulnerabilities in open-source dependencies and provides actionable remediations.
• Semgrep AppSec Platform: A managed service offering rule management, findings triage, policy-as-code, and team collaboration.
• Rule Registry: Access to thousands of community-contributed and pro rules covering OWASP Top 10, CWE, and compliance frameworks.
• Custom Rules: Write and share your own patterns using a simple YAML and pattern syntax.
• High Performance: Scans large codebases quickly by matching patterns directly on the AST without building a full parse tree.
• Offline Capability: Fully functional without internet access for local scans, ensuring privacy and speed.

Use Cases

Security Vulnerability Detection

Semgrep is widely used to identify security flaws such as SQL injection, cross-site scripting (XSS), hardcoded secrets, improper authentication, and insecure deserialization. Teams can run Semgrep as a pre-commit hook or in CI to catch issues before they reach production. The rule registry provides ready-to-use rules for common vulnerability classes.

Code Quality and Style Enforcement

Beyond security, Semgrep enforces code quality standards, detects anti-patterns, and ensures consistent code style across teams. Custom rules can be written to match specific project conventions, making it a flexible alternative to traditional linters.

Compliance Auditing

Organizations subject to regulations like PCI-DSS, HIPAA, or SOC 2 can use Semgrep to automatically verify that code adheres to required security controls. Policies can be defined and enforced across the entire codebase, with clear evidence for auditors.

Open Source Contribution Filtering

Maintainers of open-source projects use Semgrep to screen pull requests for known vulnerability patterns and coding standard violations. This helps keep the codebase secure and maintainable without manual review of every contribution.

Migration and Refactoring Safety

When migrating code from one framework to another, Semgrep can verify that no deprecated or insecure APIs are introduced. It can also enforce that new code follows the target framework's best practices.

Pricing & Plans

Semgrep is available as a free, open-source command-line tool under the LGPL 2.1 license. The Semgrep AppSec Platform offers a free tier for small teams, with paid tiers for larger teams and enterprises that require advanced features such as policy-as-code, priority support, SSO, and more. Pricing for the paid tiers is not publicly listed and is typically based on the number of developers or repositories. Visit the official website for current pricing details.

Integrations & Compatibility

Semgrep integrates with a wide range of development tools: Git repositories (GitHub, GitLab, Bitbucket), CI/CD platforms (GitHub Actions, GitLab CI, Jenkins, CircleCI, Travis CI, Azure DevOps), IDEs (VS Code, IntelliJ, Vim, Emacs via plugins), and issue trackers. It can also be used as a standalone CLI tool on Linux, macOS, and Windows.

Who Is It For?

Semgrep is designed for developers, security engineers, DevOps teams, and open-source maintainers who need a fast, flexible, and accurate static analysis tool. It is suitable for small projects as well as large enterprise codebases that require consistent security and quality enforcement.

Limitations

• Not a Dynamic Analysis Tool: Semgrep performs static analysis only and cannot detect runtime vulnerabilities or configuration issues outside of the code itself.
• Learning Curve for Custom Rules: Writing effective custom patterns requires understanding Semgrep's pattern syntax, which may take some time for new users.
• False Positives: While Semgrep generally produces fewer false positives than many traditional SAST tools, some rules may still trigger on benign code and require tuning.
• Limited Support for Some Languages: Although Semgrep supports many languages, coverage for less common or newer languages may be incomplete or experimental.

Final Verdict

Semgrep is a powerful, open-source static analysis tool that excels at finding security vulnerabilities, enforcing code standards, and integrating into modern development workflows. Its pattern-based approach makes it highly customizable and fast, while the managed platform adds valuable capabilities for teams. It is a strong choice for any organization looking to improve code security and quality without cumbersome overhead. The combination of a free, open-source core and a scalable paid platform makes Semgrep accessible to teams of all sizes.