Method

Using Trail Of Bits Fix Review

$ claude 
> /fix-review v0.8.1-beta develop --report report-competition-ammalgam.pdf

The initial scan did not find 3.2.10 and 3.2.12; these hashes were provided as additional inputs.

Fix Review Report: Cantina Audit Remediation

Source: v0.8.1-beta (976dcb9e) Target: develop (e6b0c756) Report: Cantina Competition - Ammalgam Contracts Date: 2026-01-28

Executive Summary

Category Count
Commits Analyzed ~55
HIGH Findings 12
MEDIUM Findings 14
FIXED 26
PARTIALLY_FIXED 0
NOT_ADDRESSED 0
Bug Introduction Concerns None identified

Finding Status Table

HIGH Severity (12 findings)

Finding Title Status Commit Notes
3.1.1 onlyOwner should be applied to setPluginRegistry FIXED 7d6d17ce Access control added
3.1.2 Parameter ordering bug in swap fee calculation FIXED cd2d4171 Parameter order corrected
3.1.3 Interest underestimates initial borrower interest FIXED 7b8786a9 Interest calculation fixed
3.1.4 Liquidity overpayment allows bad debt FIXED d2186c08 Overpayment handling improved
3.1.5 Liquidation premium always rounds down FIXED c559ab93 Rounding direction corrected
3.1.6 Incorrect observation index from TWAP FIXED 1e7bd94c Index calculation fixed
3.1.7 Burn more than outstanding debt when depleted FIXED c90b7771 Depleted logic removed entirely
3.1.8 Bypass saturation penalty during depletion FIXED fdfc6a98, f1ccc48b Explicit saturation updates added
3.1.9 Unsafe withdraw during asset depletion FIXED c90b7771 Depleted logic removed
3.1.10 Interest grows less than expected for short durations FIXED 2cae6962 Swap fee growth refactored
3.1.11 Insufficient validation causes deposit to fail FIXED 0065bc5a Validation improved
3.1.12 Incorrect rounding in burn functions FIXED aea59c71, 114f5dfc Rounding direction corrected

MEDIUM Severity (14 findings)

Finding Title Status Commit Notes
3.2.1 Quadratic fee growth applied past 4000 bips FIXED 913518b7 Boundary conditions fixed
3.2.2 Saturation fee could be applied twice FIXED d7d9dc98 Double application prevented
3.2.3 Fee calculation uses wrong reserve reference FIXED cd2d4171 Reserve reference corrected
3.2.4 Attacker can front-run and receive higher fees FIXED (via 3.2.6) Addressed by interest refactor
3.2.5 Interest accrual order affects outcome FIXED 02a30d0a Accrual ordering fixed
3.2.6 Incorrect ordering in repayLiquidity FIXED 78e80490 Operation ordering corrected
3.2.7 Saturation calculation rounding issues FIXED cd3cf2ed Rounding corrected
3.2.8 Fee loss from rounding error FIXED 913518b7 Boundary conditions fixed
3.2.9 Liquidation despite LTV below 100% FIXED c90b7771 Depleted logic removed
3.2.10 Burners receive excess lending fee FIXED 85735c78, 2cae6962 Issue #1018, swap fee growth refactoring
3.2.11 Burners receive excess swap fees in current block FIXED 2cae6962 Issue #984, swap fee growth removed
3.2.12 Liquidity of pool cannot be fully utilized FIXED 85735c78 Issues #1019, #1016
3.2.13 Unsafe casts in getClosestSafeValues() FIXED 9aaefd92 Safe casting refactored
3.2.14 User minimum values not checked FIXED 82998744 Protocol fees with validation

Key Remediation Patterns

1. Depletion Logic Removal (c90b7771)

The most significant fix removed the entire “depleted asset” mechanism which was the root cause of multiple vulnerabilities (3.1.7, 3.1.9, 3.2.9). This architectural change:

2. Safe Casting Refactor (9aaefd92)