Arbitrum

Back to Explore Arbitrum Arbitrum is a suite of scaling solutions for Ethereum developed by Offchain Labs that drastically reduces costs and latency. Arbitrum One is an "Optimistic Rollup", which instantly scales apps, reducing costs and increasing capacity, without sacrificing Ethereum's security. Arbitrum validators optimistically post updates to Ethereum, and the protocol uses an interactive fraud proof mechanism to resolve any disputes efficiently with a minimal on-chain footprint. Arbitrum ETH Blockchain L2 Solidity Maximum Bounty $2,000,000 Live Since 31 August 2021 Last Updated 05 November 2026 PoC Required KYC required Submit a Bug Information Scope Resources Rewards Arbitrum provides rewards in USDC on Ethereum , denominated in USD. Rewards by Threat Level Smart Contract Critical Up to: $2,000,000 Primacy of Rules High Max: $30,000 Min: $10,000 Primacy of Rules Medium Flat: $5,000 Primacy of Rules Low Flat: $1,000 Primacy of Rules Critical Reward Calculation Mainnet assets: Reward amount is 10 % of the funds directly affected up to a maximum of: $2,000,000 Rewards Body Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2.2 . This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit. All bug reports must come with a PoC in order to be considered for a reward. Critical bug reports are capped at 10% of economic damage, primarily considering the funds at risk, and taking into account branding and PR issues, at the discretion of the team. However, Critical bug reports have a minimum reward of USD 50 000 . Note: Any vulnerability that can be remediated by the Security Council is capped at a maximum severity level of High. High bug reports have a minimum reward of USD 10 000 . Additionally, vulnerabilities in the Arbitrum Nova chain and its contracts are capped at a maximum severity level of High. Payouts are handled by the Arbitrum Foundation team directly and are denominated in USD. However, payouts are done in USDC . View impacts in scope Program Overview Arbitrum is a suite of scaling solutions for Ethereum developed by Offchain Labs that drastically reduces costs and latency. Arbitrum One is an "Optimistic Rollup", which instantly scales apps, reducing costs and increasing capacity, without sacrificing Ethereum's security. Arbitrum validators optimistically post updates to Ethereum, and the protocol uses an interactive fraud proof mechanism to resolve any disputes efficiently with a minimal on-chain footprint. Porting contracts to Arbitrum requires no code changes or downloads as Arbitrum is fully compatible with most existing Ethereum developer tooling. Arbitrum Nova, is another chain that relies on AnyTrust technology and posts calldata to a Data Availability Committee, further reducing costs while adding a small trust assumption. For more information about Arbitrum and the related mainnet chains, please visit https://developer.offchainlabs.com/ . This bug bounty program is focused on the mainnet Arbitrum chains, Arbitrum One and Arbitrum Nova and their underlying technologies, Arbitrum Rollup and Arbitrum AnyTrust respectively. Any vulnerabilities unrelated to either of the two mainnet chains are not covered by this program. Issues that affect Arb1 and Nova will be treated as a single issue, and a report of the same issue with the only difference being the network will be treated as a duplicate. This program is focused on their smart contracts and is focused on preventing the following impacts: This bug bounty program is focused on their smart contracts and is focused on preventing the following impacts: Loss of user funds by permanent freezing or direct theft Temporary freezing of funds Unable to call smart contract Network shutdown Smart contract gas drainage KYC required The submission of KYC information is a requirement for payout processing. Proof of Concept Proof of concept is always required for all severities. Responsible Publication Category 3: Approval Required Prohibited Activities Default prohibited activities Any testing on mainnet or public testnet deployed code; all testing should be done on local-forks of either public testnet or mainnet Any testing with pricing oracles or third-party smart contracts Attempting phishing or other social engineering attacks against our employees and/or customers Any testing with third-party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks) Any denial of service attacks that are executed against project assets Automated testing of services that generates significant amounts of traffic Public disclosure of an unpatched vulnerability in an embargoed bounty Any other actions prohibited by the Immunefi Rules Feasibility Limitations The project may be receiving reports that are valid (the bug and attack vector are real) and cite assets and impacts that are in scope, but there may be obstacles or barriers to executing the attack in the real world. In other words, there is a question about how feasible the attack really is. Conversely, there may also be mitigation measures that projects can take to prevent the impact of the bug, which are not feasible or would require unconventional action and hence, should not be used as reasons for downgrading a bug's severity. Therefore, Immunefi has developed a set of feasibility limitation standards which by default states what security researchers, as well as projects, can or cannot cite when reviewing a bug report. Chain Rollbacks Pre-Impact Bug Monitoring Attack Investment Amount Attacks With A Financial Risk To The Attacker When Is An Impactful Attack Downgraded To Griefing? Submit a Bug Total Assets in Scope 181