Before You docker build: 7 Supply-Chain Checks for Third-Party Repos
You cloned a repo, read the README, and your fingers are already typing docker compose up. A third-party repository is untrusted input — and the build/run pipeline executes it.
Useful takeaways from this story.
You cloned a repo, read the README, and your fingers are already typing docker compose up.
A third-party repository is untrusted input — and the build/run pipeline executes it.
Check what the base image actually is FROM python:latest latest means "whatever the registry serves today" — a moving target.
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The useful part
You cloned a repo, read the README, and your fingers are already typing docker compose up. A third-party repository is untrusted input — and the build/run pipeline executes it. Most "it's just a demo repo" incidents I've audited started with a skipped two-minute review.
How it works
- Read the Dockerfile line by line — especially RUN The Dockerfile is the attack surface.
- Check what the base image actually is FROM python:latest latest means "whatever the registry serves today" — a moving target.
What to take from it
Here are seven checks, in the order that catches the most problems first.
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