Arbitrum security record

Arbitrum, Ethereumarbitrum.ioX

As of 24 Oct 2026, Arbitrum has 1 audit report on Trustblock, by Quantstamp, dated 4 Aug 2021. That report lists no open critical findings.

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Record last updated . It holds audits and findings, contracts and incidents up to Oct 2026. Trustblock does not review code.

Audits1

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AuditSecurity firmDateScopeCritical findingsReport
Arbitrum Token Bridge

Audit

Security firm: QuantstampDate: Scope: Files named in the reportNo open critical findingsOpen · certificate.quantstamp.com

Findings9

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

SeverityOpenAcknowledgedFixed
Critical000
High001
Medium001
Low142
LowDangerous External Calls From `TokenGateway`s to Arbitrary Contact by AnyoneArbitrum Token Bridge · Quantstamp · 4 Aug 2021Acknowledged

The function `transferExitAndCall` can be called by any user to call any external contracts. This enables a user to have privilege of the `TokenGateway` contract and could be used as a tool to conduct a complex attack.

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LowGreedy ContractArbitrum Token Bridge · Quantstamp · 4 Aug 2021Acknowledged

A greedy contract is a contract that can receive ether which can never be redeemed.

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LowMissing Checks if Address Is Non-ZeroArbitrum Token Bridge · Quantstamp · 4 Aug 2021Acknowledged

There are many functions that do not validate input addresses. A list of them is provided below, but they might not be comprehensive since there are too many of them. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\gateway\ArbitrumMessenger.sol`: `sendTxToL2`, `sendTxToL1`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\gateway\GatewayRouter.sol`: `_initialize`, `setDefaultGateway`, `outboundTransfer`, `finalizeInboundTransfer`, `inboundExcrowAndCall`, `getOutboundCalldata`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\ethereum\gateway\L1GatewayRouter.sol`: `_initialize`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\gateway\ArbitrumGateway.sol`: `_initialize`, `outboundTransfer`, `finalizeInboundTransfer`, `inboundExcrowAndCall`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\gateway\TokenGateway.sol`: `_initialize`, `isRouter`, `isCounterpartGateway`, `calculateL2TokenAddress`, `getOutboundCalldata`, `finalizeInboundTransfer`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\ethereum\gateway\L1ArbitrumGateway.sol`: `_initialize` `getExternalCall`, `createOutboundTx`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\ethereum\gateway\L1ArbitrumExtendedGateway.sol`: `transferExitAndCall`, `getExternalCall`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\ethereum\gateway\L1CustomGateway.sol`: `initialize`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\arbitrum\gateway\L2ArbitrumGateway.sol`: `_initialize`, `createOutboundTx`, `getOutboundCalldata`, `outboundTransfer`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\L2GatewayToken.sol`: `_initialize`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\arbitrum\gateway\L2ERC20Gateway.sol`: `_initialize`, `handleNoContract`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\arbitrum\gateway\L2WethGateway.sol`: `_initialize`, `handleNoContract`, `outBoundEscrowTransfer`, `_calculateL2TokenAddress`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\arbitrum\gateway\L2CustomGateway.sol`: `_initialize`, `handleNoContract`. 0. `packages\arb-bridge-peripherals\contracts\tokenbridge\libraries\aeWETH.sol`: `_initialize`.

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LowUnlocked PragmaArbitrum Token Bridge · Quantstamp · 4 Aug 2021Acknowledged

Every Solidity file specifies in the header a version number of the format pragma solidity (^)0.8.*. The caret (^) before the version number implies an unlocked pragma, meaning that the compiler will use the specified version and above, hence the term "unlocked".

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