Please, someone explain how it's possible to add obfuscated file to so many repositories? Do they don't have any code reviews? Also, the title is misleading, setup adds config to be auto executed by people who work on the repo. They would have to use vscode/cursor/claude/gemini. People who use codex / opencode / other harnesses are safe I guess. Details: https://www.stepsecurity.io/blog/miasma-worm-hits-microsoft-...
So this is related to the Sept 2025 security breach of Github.
> The five repos carry 1,459 GitHub stars between them, mantine-datatable alone accounting for 1,225. Stars are a rough proxy for how many developers have the source checked out locally, which is the population this attack targets.
> Every commit: unsigned, github-actions identity, chore: update dependencies [skip ci], the same six-file footprint. A 49-second sweep across five repos is automation, not a human committing. This matches Shai-Hulud self-propagation: harvest a GitHub token with write access from a prior infection, then push the persistence payload into every repo the token can reach.
https://safedep.io/miasma-worm-ai-coding-agent-config-inject...
What it is doing: https://safedep.io/config-files-that-run-code/
I'm not related to those guys. That's the simplest detailed explanation of what is happening that I've found.