Secure FOSS Component Development

For developers and maintainers of FOSS components, the CRA’s risk-based approach translates into enabling downstream risk management, rather than assuming direct regulatory responsibility.

The German Federal Office for Information Security (BSI) published the TR-03185-2 Secure Software Lifecycle for Open Source Software, a practical reference framework on how to approach open source software development from a security standpoint. The principles below build on it.

Risk-based philosophy is the core driving force of the CRA. Rather than prescribing rigid, one-size-fits-all controls, the analysis should include outcome-oriented criteria that can be implemented according to:

Security by design requires that cybersecurity considerations are embedded throughout the entire software lifecycle. In a CRA-aligned, risk-based model, security is not a separate activity but a continuous and proportionate process in which each phase contributes to the overall resilience of a FOSS component and supports downstream compliance obligations.

In open source ecosystems, governance mechanisms often serve as primary risk mitigation tools. Transparency, documentation, and community processes are not merely administrative features but core security enablers. Four elements are key:

These measures reduce systemic risk by improving accountability and enabling downstream users to assess the trustworthiness of a project.

Open source components are deeply embedded in modern software supply chains. A risk-based approach to FOSS development must therefore consider not only project-level risks but also systemic risks propagated through reuse and redistribution. Supply chain resilience is supported by encouraging:

Such practices improve the ability of downstream integrators, including small and medium-sized enterprises, to perform risk assessments and meet regulatory or contractual obligations.

The security of an end product is inseparable from the integrity of its upstream components. As the CRA moves toward implementation, the industry faces a critical challenge: how to verify the security of the millions of open source dependencies that form the backbone of global infrastructure without stifling the collaborative model that produced them.

The most viable solution lies in Article 25, which outlines a framework for voluntary security attestations. By shifting from reactive patching to proactive, standardised transparency, it allows non-profit stewards to provide tiered, risk-based assurances in exchange for remuneration that covers transparent operating costs, turning regulatory compliance into a sustainable engine for supply chain resilience. Three pillars sustain this resilience:

A commitment to maintain and secure a product throughout its operational lifetime implies continuous accountability for all incorporated components, including third-party open source libraries. Open source components evolve independently: vulnerabilities may emerge years after integration, maintainers may step back, release cadences may slow. Without structured dependency visibility, continuous monitoring, version control discipline, and documented update policies, organisations risk inheriting unmanaged technical debt and latent supply chain vulnerabilities. Concrete measures:

By combining transparency (SBOMs), structured risk assessment, continuous monitoring, and upstream participation, manufacturers can transform open source dependencies from unmanaged exposure into a strategically governed asset that supports long-term security, compliance, and trust.

Under the CRA, manufacturers are required to identify, manage, and remediate vulnerabilities in a timely and structured manner throughout the lifecycle of the product. While open source projects are not directly regulated as such, their practices significantly influence the ability of downstream manufacturers and SMEs to comply. In a risk-based model, vulnerability handling is not limited to reactive patching. It encompasses:

Smaller projects may not have the resources of large commercial vendors, but they should still implement baseline practices that enable downstream integrators to assess and manage risk effectively.

To reflect the CRA’s proportionality principle, vulnerability handling practices can be structured across three maturity levels.

For SMEs integrating FOSS components into products with digital elements, the vulnerability handling practices of upstream projects directly affect their own compliance posture. SMEs should therefore assess: