Modern cloud‑native CI/CD pipelines rely on a vast network of open‑source libraries, public container registries, and third‑party services, making the software supply chain a critical security layer. Secure supply‑chain practices begin with signed source‑code commits and mandated code reviews to prevent tampering at the inception of the pipeline. Automated Software Composition Analysis (SCA) tools scan dependencies for vulnerabilities and license risks, blocking or warning about risky or deprecated components before they reach production. Container images are built from trusted base images, scanned for CVEs and misconfigurations, and signed using tools like Sigstore or in‑registry signing capabilities. Runtime protections and integrity checks, combined with threat intelligence focused on open‑source ecosystems, ensure that even if a dependency is later compromised, organisations can detect and respond quickly. By treating the supply chain as a first‑class security domain, cloud‑native teams simultaneously boost velocity and resilience.