Module 4 · CI/CD Pipeline Hardening

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
Apr 22, 2026
6 min read
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Last updated: April 29, 2026

Pipeline attack surface: config injection, pwn-requests, unpinned actions, OIDC trust policies, ephemeral runners, signing.

The CI/CD pipeline is the single system that can build and deploy your production code. Compromise it and you control every release, every commit, every secret your pipelines touch. Attackers know this — supply chain attacks via pipeline have moved from rare to common. This module covers the specific vulnerability classes in pipelines and the hardening that actually works.

Why pipelines are high-value targets

  • They hold credentials to production: cloud deploy roles, registry push, prod databases
  • They run untrusted input: PR code from anyone, dependencies from open-source registries
  • They have build-time network and filesystem access — an attacker who executes in a build runner touches everything
  • Compromising a widely-shared pipeline (reusable workflow, shared library) cascades to many downstream repos
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