Stop your Ansible runs from leaking secrets into the local process list

Technical Briefing | 7/17/2026

You probably think your secrets are safe because you used an Ansible vault file or passed them through an environment variable. That works fine in your IDE, but I have seen this bite people in production environments where runners are shared or monitored by aggressive local security tools. When you pass arguments to tasks in a way that includes sensitive strings, they often end up visible in the process table for a split second. Anyone with read access to procfs can see your production credentials plain as day.

The procfs trap is real

Most developers assume that command arguments are private, but they are just strings held in memory and exposed via the process tree. If you are invoking shell modules or external scripts, avoid putting sensitive data directly into the command string. Instead of baking credentials into the command execution, push them through stdin or a temporary file that is immediately scrubbed. Here is the easiest way to inspect exactly what your shell is seeing during execution.

watch -n 0.1 'ps auxww | grep -v grep | grep ansible'

• Avoid using command or shell modules with sensitive variables passed as plain arguments
• Switch to using file lookups and templating for sensitive configurations
• Enable no_log on tasks that interact with secrets to keep them out of your controller logs
• Use custom filter plugins if you really must transform sensitive strings before use

If you are managing runners in a multi-tenant environment, this is not just a best practice, it is a basic security requirement. Audit your main roles to find instances of shell module usage. If you see variables being interpolated into the command line, rewrite them. It takes five extra minutes now to rewrite that task, which is a lot better than explaining a secret dump to your security team on a Friday afternoon.