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Cardano Wallet SecondFi Hit by $2.4 Million Exploit, up to $20 Million in User Funds at Risk

SecondFi said the flaw affected 374 wallets, and SlowMist estimated losses could exceed $20 million after the company secured 129 million ADA.

  • On Tuesday, SecondFi, the Cardano wallet formerly known as Yoroi, patched a major exploit that drained roughly 16 million ADA, or approximately $2.4 million, from 374 user wallets across three separate attacks.
  • The platform traced the root cause to a flaw in its proprietary wallet generation software, with the vulnerability existing at the address level where moving a seed phrase offers no protection.
  • SecondFi confirmed on Wednesday that it triggered emergency measures to secure roughly 129 million ADA, which is being transferred to an independent third-party custodian and held for affected users pending verification.
  • Cardano founder Charles Hoskinson clarified that SecondFi is not an Input Output Global product and stressed there is no ownership, control, or business relationship between the wallet and the company.
  • Blockchain security firm SlowMist estimates total losses could exceed $20 million when accounting for the full range of compromised wallets and tokens, though this figure remains unconfirmed pending an independent audit.
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Protos broke the news on Tuesday, June 23, 2026.
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