Supply Chain Attacks: Understanding Software Dependency Risk
Updated: Sep 19
On 4 June 2026, the National Cyber Security Centre (NCSC) issued guidance warning that attackers are increasingly targeting open source software packages. This alert highlights the need for firms in accountancy, legal, finance, and regulated SMEs to review their software dependencies carefully. Understanding and managing software dependency risk is now a crucial part of cyber resilience, supplier assurance, and recovery planning.
Why Software Dependency Risk Matters for Regulated Firms
Modern IT systems rarely operate in isolation. Instead, they rely on a complex web of software components, many of which come from third-party sources or open source projects. These components are often integrated automatically through development pipelines or updated without manual checks. While this approach improves efficiency, it also creates hidden vulnerabilities.
Attackers can compromise a single open source package or software library and, through it, gain access to many organisations that use it. This type of attack is known as a software supply chain attack. For regulated firms, the consequences can be severe, including data breaches, regulatory penalties, and damage to reputation.
How Software Dependencies Create Exposure
Many firms use third-party software or cloud platforms that include numerous underlying components. These components might be libraries, frameworks, or tools developed by external parties. Often, these dependencies are not visible to the end user or even the IT team.
Automatic updates and continuous integration/continuous deployment (CI/CD) pipelines can introduce new or updated dependencies without thorough review. While automation speeds up development and patching, it can also allow compromised code to enter production systems quickly.
For example, a popular open source library used for data processing might be updated with malicious code by an attacker. If a firm’s software automatically pulls the latest version, the malicious code could execute within their environment before anyone notices.
What Leaders Should Ask Their IT Providers or Internal Teams
Leaders in regulated firms should engage their IT providers or internal teams with clear questions about software dependency risk:
Do we maintain a complete inventory of all software dependencies, including open source components?
Knowing what software components are in use is the first step to managing risk.
How do we monitor vulnerabilities in these dependencies?
Regular vulnerability scanning and alerts for new threats are essential.
What processes are in place to review and approve automatic updates or new dependencies?
Controls should prevent unvetted code from entering production.
How do we assess the security posture of our software suppliers and third-party providers?
Supplier assurance helps identify risks beyond your immediate control.
Is our incident response plan prepared for a software supply chain attack?
Response and recovery plans should include scenarios involving compromised dependencies.
Do we regularly test recovery procedures related to software supply chain incidents?
Testing ensures that teams can respond effectively if an attack occurs.
Practical Steps to Manage Software Dependency Risk
Maintain a Dependency Inventory
Create and update a detailed list of all software components used across your systems. This inventory should include:
Software name and version
Source or supplier
Purpose and criticality
Update frequency
This inventory helps identify which components require monitoring and control.
Monitor Vulnerabilities Continuously
Use automated tools to scan for known vulnerabilities in your software dependencies. Subscribe to security bulletins from suppliers and open source communities. Establish a process to prioritise and address vulnerabilities based on risk.
Control Updates and Development Pipelines
Implement approval workflows for software updates, especially those involving third-party components. Review changes in development pipelines to detect unexpected new dependencies. Limit automatic updates where possible or use staging environments to test updates before deployment.
Strengthen Supplier Assurance
Evaluate the security practices of your software suppliers and cloud providers. Request evidence of their security controls and incident history. Include software supply chain risk in your supplier risk assessments.
Prepare Incident Response and Recovery Plans
Update your incident response plans to cover software supply chain attacks. Define roles, communication channels, and escalation paths. Conduct regular exercises to test your team’s readiness to detect, contain, and recover from such incidents.
Building Cyber Resilience Through Software Supply Chain Awareness
Software supply chain attacks are a growing threat that can bypass traditional security controls. For UK regulated firms, managing software dependency risk is no longer optional. It must be part of a broader cyber resilience strategy that includes supplier assurance and recovery planning.
By understanding the hidden risks in software dependencies, maintaining clear inventories, monitoring vulnerabilities, and involving IT teams in careful update management, firms can reduce their exposure. Regularly testing incident response and recovery plans ensures that when an attack occurs, the organisation can respond swiftly and effectively.
