How to Secure Your Software Supply Chain With SBOMs, Signing, and SLSA

Most production code consists of third-party dependencies that are trusted by default, making the software supply chain a prime attack vector, as seen in incidents like SolarWinds and the xz backdoor. A Software Bill of Materials (SBOM) provides a machine-readable inventory of every component in a software artifact, enabling faster vulnerability assessment when new CVEs emerge. Code signing and provenance verification — facilitated by tools like Sigstore — help confirm that artifacts are genuine and unmodified throughout the build process. The SLSA framework offers a tiered maturity model for hardening build pipelines, while least-privilege CI practices and dependency hygiene further reduce exposure. Shifting security checks as early as possible in the pipeline — ideally at pull-request stage — significantly reduces the cost and impact of discovering vulnerabilities later in production.