Rule Information
Tags
dockerdockerfilednfpackage-managerfedorarhelupdatereproducibilitybest-practiceanti-pattern
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-009 --project .1
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rule.py
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About This Rule
Understanding the vulnerability and how it is detected
Detects use of 'dnf update' in Dockerfiles. Running system updates in Docker builds creates unpredictable, non-reproducible images and can introduce breaking changes or security vulnerabilities.
How to Fix
Recommended remediation steps
- 1Review your Dockerfile to address the avoid dnf update 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 Avoid dnf update
Avoid 'dnf update' in Dockerfiles. Use specific base image versions for reproducible builds.
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 Avoid dnf update rule runs in CI and posts inline review comments on the exact lines — no dashboard, no SARIF viewer.