Can You Trust Your Build Cache?
Blog post from Nx
A remote build cache is a critical yet often overlooked component of software infrastructure, shared across branches and CI jobs within an organization, and it serves as a trust boundary that can be vulnerable to exploitation if not properly configured. For a cached artifact to be reliable, it must be identified by an accurate key, and only trusted builds should be able to write under that key. Misconfigurations, like undeclared inputs in caching solutions such as Nx and Turborepo, can lead to compromised artifacts being served under a clean hash, making it indistinguishable from legitimate builds and opening the door to potential software supply-chain attacks. These issues arise when a build reads files not included in its hash, allowing malicious or outdated artifacts to be replayed without detection. The document suggests several mitigation strategies, such as building release artifacts without a cache, separating cache access by trust level, and employing Nx Cloud's Task Sandboxing to enforce input validation and prevent undeclared file reads, thereby securing the cache and ensuring trustworthy outputs.
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