https://medium.com/immunefi/moonbeam-astar-and-acala-library-truncation-bugfix-review-1m-payout-41a862877a5bMoonbeam, Astar, And Acala Library Truncation Bugfix Review — $1m Payout
"On June 27th, whitehat pwning.eth submitted a critical bug report that impacted the Polkadot ecosystem via Immunefi, demonstrating the possibility of minting valid but depegged wrapped tokens.
The bug, which was found within Frontier — the Substrate pallet that provides core Ethereum compatibility features within the Polkadot ecosystem–impacted Moonbeam, Astar Network, and Acala.
The estimated potential damage from the vulnerability amounted to approximately $200m across the three projects, which was swiftly prevented due to the whitehat’s brilliant disclosure."