XZ Backdoor and the Future of OSS


Possible implications of the recently discovered XZ backdoor in the Open Source Software community

I wonder what are the impacts of the recently discovered XZ backdoor in the Open Source Software community. Open Source is based on collaboration, but if there is a big gap that lets situations like this happen, it would be very disruptive.


The discovery of the XZ backdoor in the Open Source Software community has exposed some significant vulnerabilities and implications for future operations. A need for enhanced scrutiny of code contributions and maintainers is clear, as the backdoor came from a new maintainer whose contributions were not adequately vetted. The fact that the XZ package had been maintained by a single person for over 13 years also highlights the risks of relying heavily on few volunteers. It is likely that companies and developers will now exercise increased caution when using open source dependencies, and strategies for better security and supply chain management may gain more attention. Adequate funding and support models for open source projects too will need to be reconsidered to ensure their long-term security.

The recent XZ backdoor incident has significant implications for the open source community going forward:

  1. It highlights the fragility and potential security risks in widely-used open source projects that are maintained by a small number of volunteers. The XZ package, despite being critical to Linux, MacOS and OpenSSH, was maintained by just one person for over 13 years. This puts an immense burden on solo maintainers and makes projects vulnerable if their accounts are compromised.

  2. It emphasizes the need for better vetting of code contributions and new maintainers in open source projects, as seen from the issue discussed on Google’s oss-fuzz. The backdoor was introduced by a new maintainer who was added to the project and whose contributions were not scrutinized closely enough. Open source projects will need to improve their processes around reviewing code and granting commit privileges.

  3. It may lead to more caution and skepticism around consuming open source dependencies as discussed in an article on WIRED. Companies and developers may start looking more closely at the health, security practices and provenance of the open source components they use. Projects with small teams or opaque practices may lose trust.

  4. It could spur investment into better security tooling, code signing and software supply chain management for open source. Efforts like Sigstore, which enable signing and verifying open source packages, may gain more adoption. Companies may put more resources into auditing and hardening their open source dependencies.

  5. It may prompt reflection on the sustainability and funding models for critical open source infrastructure, a point highlighted in both a blog post on FJ Laboratories and a news article on Y Combinator. Incidents like these underscore how much the tech ecosystem relies on volunteer-run open source projects. More sustainable funding and support models for these projects may be needed to ensure their long-term health and security.


In summary, while damaging, this incident will likely be a catalyst for the open source community to develop better security practices, tooling and sustainability models going forward. But it also reveals the fragility and massive impact that a vulnerability in a single open source component can have.

The discovery of XZ backdoor in the Open Source Software community is a concerning revelation. However, this incident can serve as a much-needed wakeup call for the need for better security practices in widely-used open source projects. It has brought attention to the vulnerability of these projects when maintained by a single individual and the overlooking of thorough scrutiny of new maintainers and their contributions. This could catalyze a shift towards more skepticism in consuming open source dependencies, but it could also spur investment into better security tooling and supply chain management. Lastly, this incident underscored the need for reconsideration of the funding models for critical open source infrastructure to maintain their credibility and long-term security.

Written By


Cybersecurity professional and IT enthusiast with a passion for technology, music, personal growth, and Eastern philosophy. Transitioned from mechanical engineering to IT in 2020, with a full-time interest in Technology, Cybersecurity and recent advances in AI. Seeks to integrate eastern philosophy, mindfulness and a growth mindset into daily life and work.