Philknows

**Name of the Vulnerable Software and Affected Versions** Lodestar versions prior to 0.36.0 **Description** The issue is related to the representation of `uint64` values as native JavaScript `number`s in Lodestar, a TypeScript implementation of the Ethereum Consensus specification. When `uint64` values greater than 2^53 are included on-chain, Lodestar may view valid `AttesterSlashing` or `ProposerSlashing` as invalid due to rounding errors in large `number` values, causing a consensus split. Similarly, Lodestar may consider invalid `ProposerSlashing` as valid, including them in proposed blocks that will be considered invalid by the network. **Recommendations** As a temporary workaround, consider using `BigInt` to represent `Slot` and `Epoch` values in `AttesterSlashing` and `ProposerSlashing` objects, carefully using `BigInt` just where necessary for consensus. For versions prior to 0.36.0, update to version 0.36.0 to resolve the issue.