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> I'm also north of 90% probable that I could weaponize it to turn any image tag on the Internet into "roots your local machine"

Definitely not saying you're wrong, but I'm not convinced this is doable. Every exploit I've seen requires a request body -- how would you do that with an IMG tag?

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Go on a Rails security safari, armed with the knowledge that any YAML parsing is victory, and pay very careful attention to code paths involving Rails/Rack route/parameter processing, especially anything which smells of magic. To clarify: I haven't actually done the work yet.

I'm actually going on a Rails security safari later, though not particularly looking to widen this/these vulnerabilities. I figure I've gotten enough out of the community over the years to contribute part of a workweek and get one more hole plugged.

Not unless nginx/apache routes the request directly to public/. There will definitely be more code-paths to YAML.load, but so far ActionDispatch::Http::Parameters has been the entry point.

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