4TB of Voice Samples Were Just Stolen from 40,000 AI Contractors

Voice cloning has become incredibly easy, good, and, in some cases, useful. Advanced AI models only need a few seconds of your voice to create a convincing clone – which also means that with those few seconds of your voice, I can create a convincing spoof of you. Which, in turn, means that when your voice data is stolen, you might be deep in the s#!%.

On April 4, 2026, the extortion group Lapsus$ posted Mercor on its leak site. The dump is reported at roughly four terabytes and bundles a payload that breach analysts have been warning about for two years: voice biometrics paired with the same person’s government-issued identity document. According to the leaked sample index, the archive covers more than 40,000 contractors who signed up to label data, record reading passages, and run through verification calls for AI training.

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Pascal Finette @radical