It has been discovered that threat actors might take over expired Amazon S3 buckets to serve rogue binaries without changing the actual modules, in what is a new type of software supply chain attack targeted at open source projects.
The attack was initially noticed when a npm package called bignum, which up until version 0.13.0 relied on an Amazon S3 bucket to download pre-built binary versions of an addon called node-pre-gyp during installation, was subjected to it.