Rule Information
Tags
dockerdockerfileportexposevalidationinput-validationcorrectnessnetworkingconfiguration
CWE References
Interactive Playground
Experiment with the vulnerable code and security rule below. Edit the code to see how the rule detects different vulnerability patterns.
pathfinder scan --ruleset docker/DOCKER-COR-002 --project .1
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rule.py
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About This Rule
Understanding the vulnerability and how it is detected
Detects EXPOSE instructions with invalid port numbers. Valid ports are 1-65535.
How to Fix
Recommended remediation steps
- 1Review your Dockerfile to address the invalid port number issue
- 2Follow Docker official best practices for image building
- 3Use docker build --check to validate Dockerfile syntax and best practices
Similar Rules
Explore related security rules for Docker
Frequently Asked Questions
Common questions about Invalid Port Number
EXPOSE instruction has invalid port number. Valid ports are 1-65535.
Review the secure code example in the playground above and apply the recommended pattern to your Dockerfile or docker-compose.yml.
New feature
Get these findings posted directly on your GitHub pull requests
The Invalid Port Number rule runs in CI and posts inline review comments on the exact lines — no dashboard, no SARIF viewer.