FLOW-16: Precision loss in cross-VM amount conversions

[liobrasil]

Severity: Informational

Files Affected

• cadence/contracts/FlowYieldVaultsEVM.cdc

Description

Converting between EVM's UInt256 (18 decimals) and Cadence's UFix64 (8 decimals) truncates precision beyond 8 decimal places. Sub-1e-8 FLOW dust may be lost.

Not exploitable - truncation causes users to receive slightly less, not more. The 1 FLOW minimum deposit mitigates dust issues.

Recommendation

Document this limitation for users.

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Parent Issue: #15

[vishalchangrani]

Lets update the Cadence datatype instead to be one that is broader than EVM's UInt256