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Someone has maintainer/admin access to the repository and has force-pushed to master overwriting the git history.

Notice that the original commit is verified: https://github.com/pedronauck/reworm/commit/df8c1803c519f599...

While the malicious one is not: https://github.com/pedronauck/reworm/commit/d50cd8c8966893c6...

This reveals a deeper flaw in the whole git/npm pipeline (would apply to other systems like PyPI etc, not npm exclusively). These systems should operate on a "pull" model, not a push. The system should have rejected a build that wasn't derived from the latest in its repository. It would be quite easy in concept to set up one's own system to pull every source on npm and alert when the upstream has deviated.

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