At Open Source Summit Europe 2026, one message surfaced repeatedly: organizations and governments that merely consume open-source remain dependent on others to shape their future. Those that govern, maintain, secure, and sustain open-source ecosystems gain influence, resilience, sovereignty, and strategic leverage. The conversation around sovereignty is evolving within and outside the open-source community: The question is not how Europe can protect itself from external dependencies. The question is rather how Europe can become an indispensable participant in the ecosystems on which its digital future depends.

Open-Source Has Become Critical Infrastructure

Open-source is no longer just a development model. It underpins cloud platforms, AI systems, cybersecurity tools, and digital public services. Yet many of the projects supporting Europe’s digital economy still depend on small groups of maintainers who face growing pressure from cybersecurity threats, vulnerability management, compliance demands, and community expectations.

A recurring challenge highlighted at the summit was maintainer sustainability. Security workloads continue to grow while many projects lack sufficient support. Documentation emerged as an important issue. Maintainers repeatedly noted that better documentation reduces toil, improves project adoption, and allows scarce resources to focus on higher-value work.

If open source is critical infrastructure, sustaining it must become a shared responsibility rather than the burden of a few volunteers.

Sovereignty Requires Participation, Not Isolation

The summit has reinforced a message that Forrester has been divulging for quite some time now: sovereignty is not achieved through isolation. Strong nations and organizations do not withdraw from ecosystems. They contribute to them, shape them, and help govern them. In other words, influence matters as much as control.

What You Should Know

One of the most compelling frameworks presented at the summit described four stages of sovereignty: 1. Integrity: protecting data and ensuring trust; 2. Resilience: reducing vulnerabilities and strengthening operations; 3. Continuity: maintaining control over infrastructure and supply chains; 4. Interdependency: building domestic strengths while participating in global ecosystems as an equal partner. Here the key takeaways on sovereignty and open-source:

• Contribution without governance creates a gap. One statistic resonated throughout the event: Europe contributes roughly 40% of open-source project activity while remaining underrepresented in governance and leadership structures. That distinction matters. Code contributions are valuable, but governance determines project direction, funding priorities, security investments, and long-term roadmaps.
• Active participation delivers a return multiplier. Organizations seeking greater digital sovereignty should measure not only how much open-source they consume or contribute to, but also whether they participate in foundations, steering committees, maintainership programs, and ecosystem leadership initiatives. Active participation delivers a return multiplier. It creates influence that extends beyond lines of code to become a source of leverage.
• Sustaining upstream creates more value than maintaining private forks. Speakers repeatedly emphasized that organizations cannot secure software supply chains passively. Contributing fixes, funding maintainers, improving documentation, and participating in governance strengthen the ecosystem for everyone. By contrast, maintaining isolated private forks can be costly, with one presenter estimating that a private fork can cost as much as €250,000 to sustain.
• Open-source does not automatically eliminate dependency. An open-source license may provide transparency and portability, but it does not automatically eliminate dependency. Projects dominated by a single vendor can still create concentration risk through governance control, roadmap influence, or ecosystem dominance. Technology leaders should therefore evaluate not only licenses but also contributor diversity, governance models, foundation oversight, and long-term sustainability.
• Open-source is a strategic dependency that must be actively managed. Digital sovereignty is now a board-level priority, while open-source components are embedded throughout modern technology stacks. Organizations need visibility into the software they depend on, the communities that maintain it, and the risks associated with critical dependencies.

The Future Of Sovereignty In Open-Source Is Ecosystem Influence

The emergence of major AI alliances, foundation-led initiatives, and agent-friendly technologies suggests that active participation will become even more important in the AI era. The organizations that help build, govern, and sustain these ecosystems will be better positioned to influence standards, innovation, and market direction. The most important takeaway from Open-Source Summit Europe 2026 is simple: Digital sovereignty for the open-source community is about what members help shape, not just what they are able to control. The future does not belong to those who simply use open-source, but to those who actively participate in its success.

Reach out to Forrester and schedule a guidance session or an inquiry to help guide your sovereign strategy and dig deeper into the broader concept of open-source in the context of digital sovereignty