Genie's API caching bug shared garage access across all users

threepointone · x · 2026-09-12

Genie enabled caching on their garage-door API, causing every user's garage door state to be shared with everyone else on the API. It's a textbook shared mutable cache failure—the kind of bug nearly every developer hits at least once in their career.

Related event: Garage Door API's Shared Cache Leaked Users' Data to Each Other(2 posts)→

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