Rule Information
Tags
dockerdockerfileyumpackage-managercentosrhelcachecleanupimage-sizeoptimizationbest-practice
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-BP-012 --project .1
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rule.py
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About This Rule
Understanding the vulnerability and how it is detected
Detects 'yum install' commands without subsequent 'yum clean all'. Package manager caches unnecessarily increase image size by storing package metadata and repository information that is not needed at runtime.
How to Fix
Recommended remediation steps
- 1Review your Dockerfile to address the missing yum clean all issue
- 2Follow Docker official best practices for image building
- 3Use docker build --check to validate Dockerfile syntax and best practices
References
External resources and documentation
Similar Rules
Explore related security rules for Docker
MEDIUM
Base Image Uses :latest Tag
Base image uses ':latest' tag or no tag (defaults to latest). This makes builds non-reproducible.
INFO
Deprecated MAINTAINER Instruction
MAINTAINER instruction is deprecated. Use LABEL org.opencontainers.image.authors instead.
LOW
apt-get Without --no-install-recommends
apt-get install without --no-install-recommends. This installs unnecessary packages, increasing image size and attack surface.
Frequently Asked Questions
Common questions about Missing yum clean all
RUN instruction uses 'yum install' without 'yum clean all'. This leaves package cache and increases image size.
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 Missing yum clean all rule runs in CI and posts inline review comments on the exact lines — no dashboard, no SARIF viewer.