Competitive Audits
First Flights
Leaderboard
Docs
Toggle theme
Sign up
Log in
All First Flights
Puppy Raffle
Submissions
AI First Flight
Puppy Raffle
AI First Flight #1
Beginner Friendly
Foundry
Solidity
NFT
EXP
AI First Flight
EXP
Nov 6th, 2026 → Nov 13th, 2026
View repo
View results
10 / 10
Submissions
Severity
Validity
Tags
Author
#1
Reentrancy in refund() lets an attacker drain all entrance fees
High
Valid
[H-02] Reentrancy Vulnerabi...
ward0x
#2
Weak on-chain randomness lets the caller choose the winner and the puppy rarity
High
Valid
[H-03] Randomness can be gamed
ward0x
#3
Refunded slots are still counted in selectWinner, so the pool is overstated and the raffle gets stuck or fees get locked
High
Valid
[H-04] `PuppyRaffle::refund...
ward0x
#4
uint64 totalFees overflows silently on solc 0.7.6, locking all fees
High
Valid
[H-05] Typecasting from uin...
ward0x
#5
Two refunds leave duplicate address(0) entries and block every new enterRaffle call
High
Valid
[H-04] `PuppyRaffle::refund...
ward0x
#6
O(n^2) duplicate check in enterRaffle makes entry gas grow quadratically (DoS)
Medium
Valid
[M-01] `PuppyRaffle: enterR...
ward0x
#7
Strict balance equality in withdrawFees can be broken by forced ETH, locking fees forever
Medium
Valid
[M-02] Slightly increasing ...
ward0x
#8
A winner contract that cannot receive ETH or ERC721 makes selectWinner revert and blocks the draw
Medium
Valid
[M-03] Impossible to win ra...
ward0x
#9
getActivePlayerIndex returns 0 for non-players, the same as the first player's index
Low
Valid
[L-01] Ambiguous index retu...
ward0x
#10
Off-by-one in rarity thresholds: common 71%, legendary only 4% instead of 70/5
Low
Valid
[L-03] Participants are mis...
ward0x
Previous
1
Next
Support
FAQs
Can't find an answer? Chat with us on Discord, Twitter or Linkedin.
What is Cyfrin CodeHawks?
What is a competitive audit?
How can I host a competition on CodeHawks?
How is a contest prize pool determined?
How do I get rewarded?
What is a First Flight?
Give us feedback!
