What Is Software Supply Chain Security? The Complete Guide

Software supply chain security focuses on protecting all components involved in building, testing, and deploying software, such as open-source libraries, CI/CD pipelines, container images, and AI-generated code, from vulnerabilities and malicious attacks. This security domain is increasingly important due to the widespread use of open-source software, which constitutes 70 to 90% of modern applications, and the complex web of dependencies that can introduce risks. OWASP has ranked software supply chain failures as a major security risk, prompting regulations like Executive Order 14028 and the EU Cyber Resilience Act to mandate security controls and Software Bill of Materials (SBOM) production. Effective security involves identifying all software components, verifying their integrity, and enforcing policies to prevent compromised packages from reaching production. Additionally, the rise of AI-generated code presents new risks, such as package hallucination, which require the same scrutiny as human-written code. The document underscores the importance of full transitive dependency mapping, real-time malware detection, and reachability analysis to reduce exposure to vulnerabilities and highlights past incidents like the SolarWinds attack to illustrate the potential impact of compromised supply chains.

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