Imagine: the team ships a release, and an hour later it turns out that the container included a vulnerable version of a library that no one noticed. Or worse — an API key to the cloud accidentally ended up in the repository. Such incidents are costly, and they can be prevented by embedding security checks directly into the development pipeline. This is exactly what DevSecOps teaches — an approach where security becomes part of CI/CD, not a final gate before deployment.
In this article, we'll break down how key tools work (SAST, DAST, dependency scanning, secrets management, SBOM), where the process most often breaks, and how to choose a learning path. Spoiler: there is no universal recipe, but there are patterns that will help you avoid the pitfalls.
Why security in CI/CD is not "another stage" but a culture change
Traditionally, security was a separate team that got involved at the end of the project and "stamped" it. The problem is that by that time, fixing vulnerabilities costs many times more, and developers have already lost context. DevSecOps flips the model: checks are embedded into every commit, and responsibility is distributed among developers, security specialists, and operations.
The mechanism is simple: automated scanners analyze code, dependencies, and configurations on every push. If they find a problem, the build stops or a task is created. This reduces risk but requires configuration; otherwise, the pipeline becomes a "brake."
How it works in practice: breaking down one task
Let's take a typical scenario: there is a repository with a Python application that is built into a Docker image and deployed to Kubernetes. The team wants to automatically check code for vulnerabilities and not let critical issues into production.
Step 1. Choosing tools. For static analysis (SAST), Semgrep is a good fit — it's fast, supports custom rules, and easily integrates into the pipeline. For dependency scanning — Snyk or GitHub's built-in Dependabot. For containers — Trivy, which checks images for known CVEs. For infrastructure as code — Checkov (analyzes Terraform, Kubernetes manifests).
Step 2. Configuring the pipeline. In CI (e.g., GitLab CI or GitHub Actions), we add steps:
stages:
- test
- security
sast:
stage: security
image: returntocorp/semgrep
script:
- semgrep ci --config=auto
allow_failure: false
dependency_scan:
stage: security
image: snyk/snyk-cli
script:
- snyk test --severity-threshold=high
allow_failure: false
trivy:
stage: security
image: aquasec/trivy
script:
- trivy image --exit-code 1 --severity CRITICAL myapp:latest
Step 3. What will go wrong if you skip configuration.
- False positives. Semgrep may find a "vulnerability" in test code or in a library that is not used in production. Without exceptions, developers will start ignoring alerts.
- Thresholds too strict. If you block the build on any warning, the team will spend days triaging. Better to start with critical and high levels.
- Secrets in code. Scanners like TruffleHog or Gitleaks should check commits for keys. But if a key has already entered the history, simply deleting it is not enough — you need to revoke the key and clean the history (e.g., via git filter-repo).
Where the mechanism breaks: 4 failure scenarios
Even a well-configured DevSecOps can fail. Here are typical situations.
1. The tool stopped updating
Vulnerability scanners depend on CVE databases. If Trivy or Snyk don't update their databases, they miss new threats. How to notice: compare results with an independent source (e.g., GitHub Advisory Database) or set an alert for database staleness. What to do: update the tool or switch to an alternative.
2. The rule doesn't apply to your stack
A SAST tool may not support a new language or framework. For example, Semgrep has limited Kotlin support. How to notice: reports will contain only generic checks, and language-specific ones will be missing. What to do: use a combination of tools or write custom rules.
3. The secret expired and the application crashed
When managing secrets (Vault, AWS Secrets Manager), it's important to configure rotation. If you forget, the application loses access to the database. How to notice: monitoring authentication errors. What to do: automate rotation and add alerts a few days before expiration.
4. SBOM doesn't match the actual composition
SBOM (Software Bill of Materials) is generated at the build stage, but if packages from the cache end up in the image, the SBOM may be incomplete. How to notice: discrepancy between the SBOM and the actual package list (e.g., via docker sbom). What to do: rebuild the image with the --no-cache flag and verify the SBOM for completeness.
Learning paths: self-study, courses, practice
You can learn DevSecOps in different ways. Here's an honest trade-off.
| Path | Time | Money | Result |
|---|---|---|---|
| Self-study (documentation, articles) | 6–12 months | Minimal (only time) | Deep understanding, but possible gaps and lack of feedback |
| Online courses | 2–4 months | From $300 | Structured program, but without real experience |
| Practice at work (internship, pet project) | 3–6 months | Free (if work) | Skills for solving real tasks, but depends on the environment |
Self-study is good for those who already have experience in development or administration. Courses provide a system, but often lack practice. Ideally, combine: a course for the basics, a pet project for reinforcement.
Who DevSecOps suits and who it doesn't
Suits:
- Developers who want to expand their competencies and influence product security.
- Security specialists who want to automate routine tasks.
- DevOps engineers who want to add security to pipelines.
Doesn't suit:
- Those who are not ready for continuous learning (tools and threats change quickly).
- Those who expect only theory without practice — DevSecOps requires hands-on.
- Beginners without IT experience: better to first master the basics of development or administration.
In conclusion
DevSecOps is about automation and culture. You can start small: add secrets scanning to pre-commit, set up SAST for a new project. Gradually expand. If you need structure and feedback, check out the course DevSecOps (SAST/DAST) — it covers tools and their integration into CI/CD, and personalized lessons help you move at your own pace. See also , and QA Engineer.
You can start here: DevSecOps. See also , and Spreadsheets Don't Lie, They Just Return #N/A.