mediumLogic errorEVM-Solidity
Putty: An attacker can create a short put option order on an NFT that does not support ERC721 (like cryptopunk), and the user can fulfill the order, but cannot exercise the option
- Payout
- $0
- Protocol
- Putty
- Disclosed
- Aug 7, 2026
- Source
- code4rena
The Putty protocol incorrectly assumes that all NFT assets used as underlying collateral in options contracts support the full ERC-721 standard. By using a safeTransferFrom implementation that requires the onERC721Received callback, the protocol unintentionall …
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References
- https://github.com/code-423n4/2022-06-putty-findings/issues/16
- https://github.com/code-423n4/2022-06-putty-findings
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