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Snowman Merkle Airdrop
Submissions
AI First Flight
Snowman Merkle Airdrop
AI First Flight #10
Beginner Friendly
Foundry
Solidity
NFT
EXP
AI First Flight
EXP
Jun 14th, 2026 → Jun 14th, 2026
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10 / 10
Submissions
Severity
Validity
Tags
Author
#1
claimSnowman builds the Merkle leaf from live balanceOf instead of a committed amount, bricking any claim after a balance change
High
Invalid
sub99
#2
EIP-712 MESSAGE_TYPEHASH misspells address as addres, breaking signature verification for every standard signer
High
Valid
[H-02] Unconsistent `MESSAG...
sub99
#3
buySnow resets the global s_earnTimer on every purchase, letting anyone permanently block earnSnow for all users
Low
Valid
[L-02] Global Timer Reset i...
sub99
#4
s_hasClaimedSnowman is set but never checked, allowing repeat claims once the Snow balance is replenished
Low
Valid
[L-01] Missing Claim Status...
sub99
#5
buySnow accepts a non-exact msg.value yet still pulls the full WETH fee, double-charging the user and locking the ETH
Medium
Invalid
sub99
#6
earnSnow uses a single global timer instead of a per-user mapping, so one user's earn resets everyone's cooldown
Low
Valid
[L-02] Global Timer Reset i...
sub99
#7
Snow pulled into SnowmanAirdrop has no withdraw or burn path and is permanently locked in the contract
Low
Invalid
sub99
#8
collectFee uses a bare ERC20 transfer instead of safeTransfer, silently failing for non-standard tokens
Low
Invalid
sub99
#9
Claim signature is not bound to msg.sender and has no nonce, making it freely relayable and front-runnable
Low
Invalid
sub99
#10
mintSnowman has no access control — anyone can mint unlimited Snowman NFTs, bypassing the airdrop entirely
High
Valid
[H-01] Unrestricted NFT Min...
sub99
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