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You can also fork all the dodgy actions you consume.

Not really a solution at enterprise level and it exposes to the risk of likely not patching them as often

Yes but SHA1 collisions are easy enough to engineer, so even then compromise is probably possible.

(I don't know how hard it is to push a different object to an existing SHA on GitHub—I'm guessing that you probably have to remove all references to the original object at that SHA?)

SHA1 collisions are easy, but nobody has publicly revealed a second-preimage attack. With a collision you create two inputs that hash to the same output, with a second-preimage attack you are given one existing input & have to find a second input that hashes to the same output. Collisions are much easier since you can control both inputs.

That's a good point. Setting up a benign release first that you have engineered a same-hash malicious release you can swap in later is a higher bar than gaining control of a repo and immediately replacing a popular release.

Yes and I do that and Dependabot supports it but most people wouldn’t bother