Reentrancy in Reentrancy.withdrawBalance() (tests/reentrancy.sol#14-21): External calls: - ! (msg.sender.call.value(userBalance[msg.sender])()) (tests/reentrancy.sol#17) State variables written after the call(s): - userBalance[msg.sender] = 0 (tests/reentrancy.sol#20) Reentrancy in Reentrancy.withdrawBalance_nested() (tests/reentrancy.sol#64-70): External calls: - msg.sender.call.value(amount / 2)() (tests/reentrancy.sol#67) State variables written after the call(s): - userBalance[msg.sender] = 0 (tests/reentrancy.sol#68) Reference: https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities tests/reentrancy.sol analyzed (3 contracts with 1 detectors), 2 result(s) found Use https://crytic.io/ to get access to additional detectors and Github integration