The price of Map Protocol’s native token (MAPO) plummeted by 96% due to a vulnerability in the cross-chain bridge Butter Network.
The perpetrator exploited a bug in a Solidity smart contract, issuing a quadrillion new coins.
🚨 Community alert@MapProtocol / @ButterNetworkio bridge exploited on Ethereum and Bsc.
Attacker tricked Butter Bridge V3.1 (OmniServiceProxy) into minting ~1 quadrillion MAPO — about 4.8M× the legitimate ~208M supply — directly to a brand-new EOA.
More details in🧵
— Blockaid (@blockaid_) May 20, 2026
The value of MAPO fell to $0.00009 within hours. The scale of issuance exceeded the market supply by tens of thousands of times. At the time of writing, prices had recovered to $0.002.
The hacker managed to sell about a billion tokens through Uniswap liquidity pools, netting 52 ETH (~$110,000). Blockaid experts reported that nearly a trillion MAPO remains in the hacker’s wallet, posing a threat to liquidity on other exchanges.
Technically, the attack was possible due to a flaw in message verification logic. The hacker sent a fake request for transaction replay, which the bridge recognized as valid. Project keys were not compromised.
The Map Protocol team has halted the main network and is preparing a migration to a new contract. Developers promised to take a snapshot of user balances for the distribution of new assets. Tokens in the hacker’s addresses will be annulled.
MAP Protocol has suspended the conversion service between MAPO tokens on the original ERC20 contract address 0x66d79b8f60ec93bfce0b56f5ac14a2714e509a99 across the BSC and Ethereum networks and MAPO on the MAP Protocol mainnet. All relevant exchanges have also been notified to…
— MAP Protocol (@MapProtocol) May 21, 2026
Butter Network stated that user funds are secure.
Update on ButterSwap:
Investigation is targeted to conclude within the next 12 hours. Pending swaps will be processed once it is safe to resume.To reiterate: user funds are not at risk, and every affected swap will be processed in full once it is safe to resume. https://t.co/UEqn6bZ2wW
— ButterNetwork (@ButterNetworkio) May 20, 2026
Map Protocol positions itself as a compatibility layer for asset exchange between Bitcoin and networks like Ethereum, BNB Chain, TRON, and Solana.
In April, a record number of hacks were recorded in the crypto industry for a single month. More than 20 incidents resulted in losses of $651 million.
In May, hacking attacks targeted Ekubo, TrustedVolumes, THORChain, Verus, and Echo.