How a Single Solidity Flaw Let an Attacker Mint 1 Quadrillion MAPO Tokens

 



Cross-chain bridges have been exploited before. The Nomad Bridge lost over $186 million in 2022 from an authentication error. The Ronin Bridge hack wiped out hundreds of millions more. The Butter Bridge exploit on May 20, 2026 is a different kind of story because the flaw used was one Solidity developers are specifically warned about.

Security firm Blockaid identified the attack in real time. The attacker used a technique involving abi.encodePacked, a Solidity function that concatenates multiple fields without length prefixes. When four dynamic-bytes fields are packed this way inside a hash verification check, two entirely different inputs can produce the same output hash. The bridge could not distinguish between them. A legitimate oracle-signed message was planted. A malicious retry was crafted to match its hash exactly. The bridge verified it and executed a mint of 1 quadrillion MAPO tokens.

That figure is not a typo. It is 4.8 million times the legitimate circulating supply of 208 million MAPO. The token crashed from around $0.003 to near $0.00009 at the lowest point before partially recovering.

MAP Protocol paused the ERC-20 bridge immediately and warned holders to stop trading MAPO on Uniswap and PancakeSwap. All major exchanges were notified to disable deposits and withdrawals. A new contract address is coming, and a pre-attack snapshot will decide which holdings are valid for migration. Tokens bought on DEXs after the exploit began may not qualify.

The full breakdown of the attack mechanics, what the snapshot means for MAPO holders, and what MAP Protocol's official statement covers in detail is reported at CryptoNewsLive.org.

For any holder sitting on MAPO right now, the message from MAP Protocol is clear: do not move, trade, or transfer legacy ERC-20 MAPO until the official migration rules are published through official channels. Any token movement based on unofficial links, registration forms, or private messages is a phishing risk.

Visit CryptoNewsLive.org for the full report and ongoing updates as MAP Protocol releases the new contract and snapshot details.

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