View Source Credo.Check.Warning.LeakyEnvironment (Credo v1.7.5)


This check is disabled by default.

Learn how to enable it via .credo.exs.

This check is tagged :controversial

This means that this check is more opinionated than others and not for everyone's taste.

This check has a base priority of high and works with any version of Elixir.


OS child processes inherit the environment of their parent process. This includes sensitive configuration parameters, such as credentials. To minimize the risk of such values leaking, clear or overwrite them when spawning executables.

The functions System.cmd/2 and System.cmd/3 allow environment variables be cleared by setting their value to nil:

System.cmd("env", [], env: %{"DB_PASSWORD" => nil})

Check-Specific Parameters

There are no specific parameters for this check.

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.