GSC will lose allowance if it tries to lower a spender's approval

Lines of code Vulnerability details Impact GSC will lose allowance if it tries to lower a spender's approval. Proof of Concept When gsc update a spender's approval, the gscAllowance will always decrease by amount: function gscApprove address token, address spender, uint256 amount external...

NibblVault permit functionality allows redeeming only one "active" signature

Lines of code Vulnerability details Impact Contract NibblVault implements function permit that allows approving spender to spend value of tokens that belongs to owner. The issue is that structHash keeps incrementing noncesowner++ which in case of multiple "active" permits signatures of the same...