About code scanning with CodeQL
CodeQL is the code analysis engine developed by GitHub to automate security checks. You can analyze your code using CodeQL and display the results as code scanning alerts.
There are three main ways to use CodeQL analysis for code scanning:
Use default setup to automatically configure CodeQL analysis for code scanning on your repository. The default setup chooses the languages to analyze, query suites to run, and events that trigger scans, then displays a summary of the analysis settings. After you enable CodeQL, GitHub Actions will execute workflow runs to scan your code. For more information, see "Configuring code scanning for a repository."
Use advanced setup to add the CodeQL workflow to your repository. This generates a customizable workflow file which uses the github/codeql-action to run the CodeQL CLI. For more information, see "Configuring code scanning for a repository."
Run the CodeQL CLI directly in an external CI system and upload the results to GitHub. For more information, see "About CodeQL code scanning in your CI system."
CodeQL treats code like data, allowing you to find potential vulnerabilities in your code with greater confidence than traditional static analyzers.
- You generate a CodeQL database to represent your codebase.
- Then you run CodeQL queries on that database to identify problems in the codebase.
- The query results are shown as code scanning alerts in GitHub when you use CodeQL with code scanning.
CodeQL supports both compiled and interpreted languages, and can find vulnerabilities and errors in code that's written in the supported languages.
CodeQL analysis for Swift is currently in beta. During the beta, analysis of Swift will be less comprehensive than CodeQL analysis of other languages. Additionally, Swift 5.8 is not yet supported.
CodeQL analysis for Kotlin is currently in beta. During the beta, analysis of Kotlin will be less comprehensive than CodeQL analysis of other languages.
javato analyze code written in Java, Kotlin or both.
For more information, see the documentation on the CodeQL website: "Supported languages and frameworks."
About CodeQL queries
GitHub experts, security researchers, and community contributors write and maintain the default CodeQL queries used for code scanning. The queries are regularly updated to improve analysis and reduce any false positive results. The queries are open source, so you can view and contribute to the queries in the
github/codeql repository. For more information, see CodeQL on the CodeQL website. You can also write your own queries. For more information, see "About CodeQL queries" in the CodeQL documentation.
If you are scanning your code with the advanced setup or an external CI system, you can run additional queries as part of your analysis. These queries must belong to a published CodeQL query pack (beta) or a CodeQL pack in a repository. CodeQL packs (beta) provide the following benefits over traditional QL packs:
- When a CodeQL query pack (beta) is published to the GitHub Container registry, all the transitive dependencies required by the queries and a compilation cache are included in the package. This improves performance and ensures that running the queries in the pack gives identical results every time until you upgrade to a new version of the pack or the CLI.
- QL packs do not include transitive dependencies, so queries in the pack can depend only on the standard libraries (that is, the libraries referenced by an
import LANGUAGEstatement in your query), or libraries in the same QL pack as the query.
- CodeQL query packs (beta) can be downloaded from multiple GitHub container registries. For more information, see "Customizing code scanning."
For more information, see "About CodeQL packs."
Note: The CodeQL package management functionality, including CodeQL packs, is currently in beta and subject to change.