Today we're excited to announce OSS Rebuild, a new project to strengthen trust in open source package ecosystems by reproducing upstream artifacts. As supply chain attacks continue to target widely-used dependencies, OSS Rebuild gives security teams powerful data to avoid compromise without burden on upstream maintainers.The project comprises:Automation to derive declarative build definitions for existing PyPI (Python), npm (JS/TS), and Crates.io (Rust) packages.SLSA Provenance for thousands of packages across our supported ecosystems, meeting SLSA Build Level 3 requirements with no publisher intervention.Build observability and verification tools that security teams can integrate into their existing vulnerability management workflows.Infrastructure definitions to allow organizations to easily run their own instances of OSS Rebuild to rebuild, generate, sign, and distribute provenance.ChallengesOpen source software has become the foundation of our digital world. From critical infrastructure to everyday applications, OSS components now account for 77% of modern applications. With an estimated value exceeding $12 trillion, open source software has never been more integral to the global economy.Yet this very ubiquity makes open source an attractive target: Recent high-profile supply chain attacks have demonstrated sophisticated methods for compromising widely-used packages. Each incident erodes trust in open ecosystems, creating hesitation among both contributors and consumers.The security community has responded with initiatives like Security Scorecard, pypi's Trusted Publishers, and npm's native SLSA support. However, there is no panacea: Each effort targets a certain aspect of the problem, often making tradeoffs like shifting work onto publishers and maintainers.Our AimOur aim with OSS Rebuild is to empower the security community to deeply understand and control their supply chains by making package consumption as transparent as using a source repository. Our rebuil...
First seen: 2025-07-22 14:49
Last seen: 2025-07-23 05:53