Robinhood 'infinite money glitch' margin bug
Users on Reddit discovered a bug in Robinhood's trading app that let them borrow unlimited leveraged funds against unsettled trades, some briefly running six-figure positions on far smaller account balances.
The damage was public. The root cause was preventable.
Users on Reddit discovered a bug in Robinhood's trading app that let them borrow unlimited leveraged funds against unsettled trades, some briefly running six-figure positions on far smaller account balances.
What the software actually got wrong
A flaw in how Robinhood's margin-lending software calculated available buying power let certain trades be used as collateral to unlock further borrowing before the underlying trade had even settled, creating a loophole that let some users' effective leverage grow without any real limit until Robinhood patched it.
A flaw in how Robinhood's margin-lending software calculated available...
A flaw in how Robinhood's margin-lending software calculated available buying power let certain trades be used as collateral to unlock further borrowing before the underlying trade had even settled, creating a loophole that let some users' effective leverage grow without any real limit until Robinhood patched it.
Requs AI Edge Case flags this exact pattern at the requirements and architecture stage — before a single line of code implementing it exists — so the assumption behind it gets challenged while it is still cheap to fix.
Beyond code coverage and "shall" testing
Root causes like this one rarely show up in code coverage or requirements-compliance testing, because nobody wrote a requirement anticipating the specific edge case that broke. Requs AI Edge Case and Requs AI Software FMEA are built to surface exactly this class of overlooked failure mode — before the software is written.
Surfaces this before code exists
Identifies edge cases like this one at requirements and architecture time, using the Common Defect Enumeration to catalog failure patterns seen across hundreds of real-world software failures — including this one.
Connects the failure mode to the hazard
Traces this class of root cause directly to the system-level hazard it can produce, so a defect pattern like this one gets flagged during design review instead of after it ships.
Find the overlooked root causes before they ship.
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