100 EXP
Submission Details
Impact:
Likelihood:
Mint Missing Event. _mint() does not emit Transfer event violating ERC20 standardMint Missing Event-
Author Revealed upon completion
Root + Impact
Description
-
ERC20 standard requires
Transfer(address(0), to, value)event on mint. -
Token-0x
_mint()updates state but never emits the Transfer event.
// src/helpers/ERC20Internals.sol#L134-L156
function _mint(address account, uint256 value) internal {
assembly () {
// ... state updates ...
sstore(supplySlot, add(supply, value))
sstore(accountBalanceSlot, add(accountBalance, value))
@> // Missing: log3 for Transfer event!
}
}
Risk
Likelihood:
-
Every mint operation is affected
-
100% occurrence rate
Impact:
-
Wallets and block explorers won't detect mints
-
DeFi integrations relying on Transfer events will break
-
Non-compliant with ERC20 standard
Proof of Concept
function test_BUG_MintDoesNotEmitTransferEvent() public {
vm.expectEmit(true, true, false, true);
emit Transfer(address(0), alice, 100e18);
token.mint(alice, 100e18); // FAILS - no event emitted
}
Recommended Mitigation
function _mint(address account, uint256 value) internal {
assembly ("memory-safe") {
// ... existing code ...
sstore(accountBalanceSlot, add(accountBalance, value))
+ // Emit Transfer event
+ mstore(ptr, value)
+ log3(ptr, 0x20, 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef, 0, account)
}
}
---
## Finding #5 — Burn Missing Event
**Titre :**
_burn() does not emit Transfer event violating ERC20 standard
Rewards breakdown
nSLOC
222This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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