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Containers have become the default unit for shipping software for many teams. According to a CNCF report, 91% of organizations now use containers in production. When something is that widespread, the most effective improvements often look unremarkable on paper: a set of checks you can run consistently, in the same place, with the same outputs. In this article, we'll build a beginner-friendly, open-source container security starter pack that integrates into normal CI/CD, using open source container security tools: one image scan, one SBOM, and one simple policy gate.

I'll explain why using CNCF adoption data, ground the SBOM part in NTIA's minimum elements, and reference Verizon's DBIR to show why supply-chain visibility is now a daily necessity. You'll walk away with a lightweight checklist you can implement without switching platforms, and a clearer framework for deciding what deserves your attention when vulnerability concerns start piling up.

Your Containers Have Dependencies

Container security rarely fails due to lack of care; it fails because there are too many moving parts to keep track of. CNCF reported that the average number of containers used by organizations was 2,341 in 2024 (up from 1,140 in 2023), which is a clear way of saying you need repeatable habits, not heroic efforts.

That's why I like the concept of security receipts.

Not paperwork for its own sake, but small artifacts that accompany an image and quickly answer the next person's questions.

If your build can consistently produce three receipts, you've already raised the baseline:

• An image scan receipt tells you what known issues currently exist (and gives you something to compare against tomorrow).
• An SBOM receipt tells you what you actually shipped, in a structured and shareable format.
• A policy receipt records that your pipeline applied a rule and either passed or blocked the release.

There's a useful side effect: these receipts shorten conversations. Instead of debating subjective risk perceptions, you look at the same outputs and decide together.

One practical reality to plan for: vulnerability lists tend to grow over time, even when teams patch diligently. That's why reducing noise and focusing on actionable items is important. A starter pack helps a small team achieve that.

CI/CD as Your Security Autopilot

If you want this to work long-term, it has to fit where work already happens. CNCF reported that 60% of organizations use CI/CD in production for most or all applications, meaning the pipeline is already where teams trust work to move from done to shipped.

So we don't need a complex program to start. We need three defaults that your pipeline runs for every container image, and one moment where it's allowed to say stop.

Here's a simple flow that still gives you real leverage:

• Build the container image and tag it predictably (so later artifacts map cleanly to the correct build).
• Run an open-source vulnerability scan against that image and save the results as a build artifact you can review later.
• Generate an SBOM in a machine-readable format and store it alongside the image (or with a version-specific pointer).
• Enforce one policy gate that evaluates the scan and SBOM outputs, then returns a clear pass or fail for deployment.

The easiest first rule is one that teaches the right behavior without creating constant friction. A strong candidate is "no SBOM, no deploy," because it's objective and encourages transparency as a normal part of shipping.

Then, once that's stable, you can tighten your policy in small steps. Perhaps you add a vulnerability threshold, or require the SBOM to include the fields your organization cares about most. Teams often try to start with the perfect policy and end up with a policy nobody trusts. Starting small doesn't lower standards; it makes them easier to maintain.

SBOMs Make Supply-Chain Security Less Mysterious

A lot of supply-chain anxiety comes from not knowing what you depend on, or who else depends on it. Verizon's 2025 DBIR highlights that 30% of breaches were linked to third-party involvement. Verizon also notes that the 2025 DBIR's in-scope incident window runs from November 1, 2023, to October 31, 2024.

This is where SBOMs earn their keep. NTIA defines an SBOM as a formal record containing the details and supply chain relationships of components used in building software. NTIA also lays out minimum elements in three buckets: data fields, automation support, and practices/processes. That structure keeps SBOM work practical rather than academic.

For automation support, NTIA calls out common SBOM formats used to generate and consume SBOMs, including SPDX, CycloneDX, and SWID tags. That's important for container security because machines can't enforce what they can't read. If your SBOM is consistent and machine-readable, your policy gate becomes dependable rather than fragile.

SBOM expectations are still maturing. CISA has updated recommendations for minimum SBOM features, including SBOM data fields, expected comprehensiveness, identifying known-unknown dependencies, and the importance of updating outdated records. And remember, if you can't quickly answer "what's in this image?", how confident can you be when the next vulnerability alert arrives on a busy day?

Small Checks Add Big Confidence

The real win with an open-source starter pack is consistency you can explain. An image scan gives you a current snapshot, an SBOM gives you a clean inventory record, and a simple policy gate turns both into a decision your pipeline can enforce.

There's also a practical point here. CNCF reported that Asia-Pacific reached 84% adoption of cloud-native techniques at least at the "some" level (some, much, or nearly all), which is a reminder that teams in and around Vietnam are building with the same modern building blocks as everyone else.

So don't wait for a platform overhaul to achieve meaningful container security wins; start by making your pipeline produce those three receipts for every image, then iterate.