Open-Source Software Supply Chain Cybersecurity Risks

Open-source software has become an important part of modern  business technology.

Companies use open-source libraries, frameworks and components to build websites, applications, internal tools and digital products without developing every piece of software from scratch.

But this convenience also creates a new cybersecurity challenge. A business may not write a particular piece of code itself, yet a vulnerability in an open-source component can still affect the software it uses or delivers.

NIST notes that open-source components are widespread and that their provenance, integrity, maintenance and support can vary significantly between projects.

For growing businesses, managing these dependencies is becoming an important part of cybersecurity.

What Is an Open-Source Software Supply Chain?

An open-source software  supply chain is the network of software components, libraries, packages and tools used to create or operate an application.

A single business application can depend on numerous third-party components. These dependencies can themselves rely on additional packages, creating a chain that may be difficult to track manually.

The challenge is not that open-source software is inherently unsafe. The issue is understanding what components are being used, where they came from, how they are maintained and whether vulnerabilities have been discovered.

Why the Risk Is Growing

As businesses become more digital, they rely on more software and more interconnected systems.

A vulnerable component can potentially become an entry point for attackers. If the affected software is connected to customer information, financial systems or internal operations, the consequences can extend beyond the application itself.

For smaller businesses, the challenge can be greater because development and IT teams may have limited resources for continuously monitoring every dependency.

CISA recommends that organisations proactively manage open-source software risks as part of their secure software development practices.

Common Open-Source Supply Chain Risks

1. Unpatched Vulnerabilities

A software component may contain a known vulnerability that remains in use because the business does not know where it is deployed or has not updated it.

Regular vulnerability monitoring is therefore important.

2. Untrusted Components

Businesses may download packages from repositories or sources without sufficiently checking their origin or integrity.

NIST recommends using secure acquisition channels and trustworthy repositories for open-source components.

3. Dependency Complexity

The more third-party components an application uses, the harder it can become to understand its complete software composition.

A vulnerability in a deeply embedded dependency may be overlooked if businesses only track the software they directly installed.

4. Abandoned Projects

Some open-source projects may have limited maintenance or become inactive. If a critical component no longer receives security updates, businesses may eventually need to replace or isolate it.

CISA’s guidance recommends considering factors such as open-source selection, maintenance and vulnerability response when managing OSS.

How Growing Businesses Can Reduce the Risk

1. Create an Inventory of Software Components

Businesses should know which open-source libraries and packages are being used across their applications.

Even a basic inventory can make it easier to identify affected systems when a new vulnerability is discovered.

2. Use Software Composition Analysis

Software Composition Analysis (SCA) tools can help identify open-source components and known vulnerabilities.

NIST specifically recommends SCA as a way to identify publicly known vulnerabilities in open-source components.

3. Maintain a Software Bill of Materials

A Software Bill of Materials, or SBOM, provides a structured record of the components contained in a software product.

NIST describes SBOMs as a way to improve transparency and help organisations identify and remediate vulnerabilities more quickly.

For businesses supplying software to larger customers, maintaining reliable component information can also make  security assessments easier.

4. Establish an Update and Response Process

Finding a vulnerability is only useful if the organisation knows what to do next.

Businesses should define who monitors security advisories, who assesses whether a vulnerability affects them and who is responsible for applying updates or replacing affected components.

5. Use Trusted and Controlled Repositories

Instead of allowing employees or developers to obtain packages from unknown sources, businesses can maintain approved repositories or libraries containing vetted components.

NIST recommends sanctioned repositories and automated scanning as ways to strengthen open-source software controls.

Security Should Begin Before Software Deployment

Open-source security should not be treated as an issue that appears only after an attack or vulnerability disclosure.

Businesses can incorporate security checks into development and  procurement processes.

NIST’s Secure Software Development Framework provides practices covering software preparation, protection, secure production and vulnerability response.

For MSMEs, this does not require building a complex security department. It means introducing repeatable processes that match the organisation’s size and risk level.

Conclusion

Open-source software allows growing businesses to build and innovate faster, but it also creates dependencies that need to be managed.

The goal is not to avoid open-source technology. Instead, businesses should know what they use, track dependencies, monitor vulnerabilities, maintain  software inventories and establish clear response processes.

As digital operations become more interconnected, securing the software supply chain will increasingly become part of everyday business cybersecurity—not just a concern for large technology companies.