Land and Tunnel Audit

OpenZeppelinFiles named in the report

Audit · firm’s term: audit

OpenZeppelin reviewed The Sandbox (Land and Tunnel Audit) on 9 Aug 2023: 12 findings, 0 critical; 10 marked fixed, 1 acknowledged, 1 open.

No open critical findings
Open the reportOpen The Sandbox’s security record

Report hosted on blog.openzeppelin.com.

Trustblock does not review code.

Findings12

Statuses are the security firm’s own, from its report.

SeverityOpenAcknowledgedFixed
Critical000
High001
Medium002
Low117
HighPotentially unsafe usage of unchecked mathFixed

The report gives no description here.

MediumLack of documentation for complex functionalityFixed

The report gives no description here.

MediumLack of input id validation in the _ownerOf functionFixed

The report gives no description here.

LowLack of event emission after sensitive actionsFixed

The report gives no description here.

LowMissing access controlFixed

The report gives no description here.

LowMissing docstringsFixed

The report gives no description here.

LowOperator approval can cause unexpected behaviorFixed

The report gives no description here.

Lowrequire statements with multiple conditionsFixed

The report gives no description here.

LowSetting the root and child tunnel addresses can be front-runFixed

The report gives no description here.

LowUnused variableFixed

The report gives no description here.

Contracts in scope

No deployed address is recorded for this audit.

The report names a repository or files. Open the report to see its scope.

Repository and files the report names (39)

  • src/solc_0.8/common/interfaces/IPolygonLand.sol
  • src/solc_0.5/contracts_common/Interfaces/ERC721TokenReceiver.sol
  • src/solc_0.8.15/common/OperatorFilterer/IOperatorFilterRegistry.sol
  • src/solc_0.8/common/interfaces/IPolygonLandWithSetApproval.sol
  • src/solc_0.8/polygon/child/land/PolygonLandTunnelV2.sol
  • src/solc_0.8/common/BaseWithStorage/ERC721BaseTokenV2.sol
  • src/solc_0.8/polygon/root/land/LandTunnelMigration.sol
  • src/solc_0.8/common/interfaces/IPolygonLandTunnel.sol
  • src/solc_0.8/polygon/child/land/PolygonLandBaseTokenV2.sol
  • src/solc_0.5/OperatorFilterer/contracts/upgradeable/OperatorFiltererUpgradeable.sol
  • src/solc_0.5/contracts_common/Interfaces/ERC721MandatoryTokenReceiver.sol
  • src/solc_0.5/OperatorFilterer/interfaces/IOperatorFilterRegistry.sol
  • src/solc_0.8/OperatorFilterer/interfaces/IOperatorFilterRegistry.sol
  • src/solc_0.5/contracts_common/BaseWithStorage/SuperOperatorsV2.sol
  • src/solc_0.8/common/interfaces/ILandTokenV2.sol
  • src/solc_0.8/common/interfaces/IERC721MandatoryTokenReceiver.sol
  • src/solc_0.8/polygon/child/land/PolygonLandTunnelMigration.sol
  • src/solc_0.8/OperatorFilterer/contracts/upgradeable/OperatorFiltererUpgradeable.sol
  • src/solc_0.8/common/interfaces/IPolygonLandV2.sol
  • src/solc_0.5/contracts_common/BaseWithStorage/MetaTransactionReceiverV2.sol
  • src/solc_0.8/common/fx-portal/FxBaseRootTunnelUpgradeable.sol
  • src/solc_0.8/polygon/child/land/PolygonLandV2.sol
  • src/solc_0.5/BaseWithStorage/ERC2771Handler.sol
  • src/solc_0.5/LandV3.sol
  • src/solc_0.6/common/Libraries/AddressUtils.sol
  • src/solc_0.8/polygon/root/land/LandTunnelV2.sol
  • src/solc_0.5/contracts_common/Libraries/AddressUtils.sol
  • src/solc_0.8/common/BaseWithStorage/WithSuperOperatorsV2.sol
  • src/solc_0.5/Land/erc721/ERC721BaseTokenV2.sol
  • src/solc_0.5/Land/erc721/LandBaseTokenV3.sol
  • src/solc_0.8/common/interfaces/ILandToken.sol
  • src/solc_0.6/common/Interfaces/ERC721Events.sol
  • src/solc_0.6/common/Interfaces/ERC721TokenReceiver.sol
  • src/solc_0.8/common/fx-portal/FxBaseChildTunnelUpgradeable.sol
  • src/solc_0.8/common/BaseWithStorage/WithAdminV2.sol
  • src/solc_0.5/contracts_common/Interfaces/ERC721Events.sol
  • src/solc_0.6/EstateSale/ILandToken.sol
  • src/solc_0.6/common/Interfaces/ERC721MandatoryTokenReceiver.sol
  • src/solc_0.8/common/BaseWithStorage/ERC2771Handler.sol

Part of The Sandbox’s security record

The Sandbox
Audits8 audits by 2 firmsLast audit Aug 2023, by OpenZeppelin.
Critical findingsNo open critical findingsAcross the 8 reports, 1 critical finding was reported. It is marked fixed by the firm that reported it.
Open The Sandbox’s security record

Security firm

OpenZeppelin

67 projects reviewed · 184 reports · latest Aug 2026

See OpenZeppelin’s audits

Something wrong on this page? A missing report, a wrong date, a finding that was fixed since. Tell us and we check it against its source.

Tell us