Within the account_contracts execute_from_outside function, the validation on v is unnecessarily loose: whenever the correct y_parity value is 1, values like 2 or 3 will still be accepted. This is because the verify_eth_signature_uint256 function calls the recover_eth_address Cairo 1 library function to verify the signature, which parses y_parity as a boolean.
ClementWalter (Kakarot) confirmed
Kakarot mitigated:
Status: Mitigation confirmed.
