semgrep: An OCaml repository from returntocorp

Code scanning at ludicrous speed.

Semgrep accelerates your security journey by swiftly scanning code and package dependencies for known issues, software vulnerabilities, and detected secrets with unparalleled efficiency. Semgrep offers:

Code to find bugs & vulnerabilities using custom or pre-built rules
Supply Chain to find dependencies with known vulnerabilities
Secrets to find hard-coded credentials that shouldn't be checked into source code

Semgrep analyzes code locally on your computer or in your build environment: by default, code is never uploaded. Get started →.

Language support

Semgrep Code supports 30+ languages.

Category	Languages
GA	C# · Go · Java · JavaScript · JSX · JSON · PHP · Python · Ruby · Scala · Terraform · TypeScript · TSX
Beta	Kotlin · Rust
Experimental	Bash · C · C++ · Clojure · Dart · Dockerfile · Elixir · HTML · Julia · Jsonnet · Lisp · Lua · OCaml · R · Scheme · Solidity · Swift · YAML · XML · Generic (ERB, Jinja, etc.)

Semgrep Supply Chain supports 8 languages across 15 package managers.

Category	Languages
GA	Go (Go modules, `go mod`) · Javascript/Typescript (npm, Yarn, Yarn 2, Yarn 3, pnpm) · Python (pip, pip-tool, Pipenv, Poetry) · Ruby (RubyGems) · Java (Gradle, Maven)
Beta	C# (NuGet)
Lock file-only	Rust (Cargo) · PHP (Composer)

For more information, visit our supported languages page.

For new users, we recommend starting with the Semgrep Cloud Platform because it provides a visual interface, a demo project, result triaging and exploration workflows, and makes setup in CI/CD fast. Scans are still local and code isn't uploaded. Alternatively, you can also start with the CLI and navigate the terminal output to run one-off searches.

Option 1: Getting started from the Semgrep Cloud Platform (Recommended)

Register on semgrep.dev
Explore the demo findings to learn how Semgrep works
Scan your project by navigating to Projects > Scan New Project > Run scan in CI
Select your version control system and follow the onboarding steps to add your project. After this setup, Semgrep will scan your project after every pull request.
[Optional] If you want to run Semgrep locally, follow the steps in the CLI section.

Notes:

If there are any issues, please ask for help in the Semgrep Slack.

Option 2: Getting started from the CLI

Install Semgrep CLI

# For macOS
$ brew install semgrep

# For Ubuntu/WSL/Linux/macOS
$ python3 -m pip install semgrep

# To try Semgrep without installation run via Docker
$ docker run -it -v "${PWD}:/src" returntocorp/semgrep semgrep login
$ docker run -e SEMGREP_APP_TOKEN=<TOKEN> --rm -v "${PWD}:/src" returntocorp/semgrep semgrep ci

Run semgrep login to create your account and login to Semgrep.

Logging into Semgrep gets you access to:

Semgrep Supply Chain: A depenency scanner that detects reachable vulnerabilities in third party libraries
Semgrep Code's Pro rules: 600+ high confidence rules written by Semgrep's security research team
Semgrep Code's Pro engine: An advanced code analysis engine, designed to detect complex vulnerabilities, and reduce false positives

Go to your app's root directory and run semgrep ci. This will scan your project to check for vulnerabilities in your source code and its dependencies.

Semgrep Ecosystem

The Semgrep ecosystem includes the following products:

Semgrep Code - Scan your code with Semgrep's proprietary rules (written by our Security Research team) using our cross-file and cross-function analysis. Designed to find OWASP Top 10 vulnerabilities and protect against critical security risks. Semgrep Code is available on both free and paid tiers.
Semgrep Supply Chain (SSC) - A high-signal dependency scanner that detects reachable vulnerabilities in open source third-party libraries and functions across the software development life cycle (SDLC). Semgrep Supply Chain is available on both free and paid tiers.
Semgrep Secrets [NEW!] - Secrets detection that uses semantic analysis, improved entropy analysis, and validation together to accurately detect sensitive credentials in developer workflows. Book a demo to request early access to the product.
Semgrep Cloud Platform (SCP) - Deploy, manage, and monitor Semgrep at scale, with free and paid tiers. Integrates with continuous integration (CI) providers such as GitHub, GitLab, CircleCI, and more.
Semgrep OSS Engine - The open-source engine and community-contributed rules at the heart of everything (this project).

To learn more about Semgrep, visit:

Semgrep Playground - An online interactive tool for writing and sharing rules.
Semgrep Registry - 2,000+ community-driven rules covering security, correctness, and dependency vulnerabilities.

Join hundreds of thousands of other developers and security engineers already using Semgrep at companies like GitLab, Dropbox, Slack, Figma, Shopify, HashiCorp, Snowflake, and Trail of Bits.

Semgrep is developed and commercially supported by Semgrep, Inc., a software security company.

Semgrep Rules

Semgrep rules look like the code you already write; no abstract syntax trees, regex wrestling, or painful DSLs. Here's a quick rule for finding Python print() statements.

Run it online in Semgrep’s Playground by clicking here.

Examples

Visit Docs > Rule examples for use cases and ideas.

Use case	Semgrep rule
Ban dangerous APIs	Prevent use of exec
Search routes and authentication	Extract Spring routes
Enforce the use secure defaults	Securely set Flask cookies
Tainted data flowing into sinks	ExpressJS dataflow into sandbox.run
Enforce project best-practices	Use assertEqual for == checks, Always check subprocess calls
Codify project-specific knowledge	Verify transactions before making them
Audit security hotspots	Finding XSS in Apache Airflow, Hardcoded credentials
Audit configuration files	Find S3 ARN uses
Migrate from deprecated APIs	DES is deprecated, Deprecated Flask APIs, Deprecated Bokeh APIs
Apply automatic fixes	Use listenAndServeTLS

Extensions

Visit Docs > Extensions to learn about using Semgrep in your editor or pre-commit. When integrated into CI and configured to scan pull requests, Semgrep will only report issues introduced by that pull request; this lets you start using Semgrep without fixing or ignoring pre-existing issues!

Documentation

Browse the full Semgrep documentation on the website. If you’re new to Semgrep, check out Docs > Getting started or the interactive tutorial.

Metrics

Using remote configuration from the Registry (like --config=p/ci) reports pseudonymous rule metrics to semgrep.dev.

Using configs from local files (like --config=xyz.yml) does not enable metrics.

To disable Registry rule metrics, use --metrics=off.

The Semgrep privacy policy describes the principles that guide data-collection decisions and the breakdown of the data that are and are not collected when the metrics are enabled.

Upgrading

To upgrade, run the command below associated with how you installed Semgrep:

# Using Homebrew
$ brew upgrade semgrep

# Using pip
$ python3 -m pip install --upgrade semgrep

# Using Docker
$ docker pull returntocorp/semgrep:latest