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A NullPointerException is not a security vulnerability.

A race condition might, but even then, I'm not sure how likely that is to result in a vulnerability in a garbage collected language.

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NPE itself isn’t likely to be exploitable, no, but what I had in mind was more along the lines of code with logic errors handling rare cases where something is null. There’s a lot of tooling designed to catch things like that but the worst code bases tend not to use them because they’d need a lot of cleanup.

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