Optimism is a project dedicated to scaling Ethereum's technology and expanding its ability to coordinate people from across the world to build effective decentralized economies and governance systems.

Maximum Bounty
Live Since
14 January 2022
Last Updated
29 May 2024
  • PoC required

  • KYC required

Submit a Bug

Rewards by Threat Level

Up to USD $2,000,042
USD $50,000
USD $15,000
Smart Contract
Up to USD $2,000,042
USD $50,000

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System. 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.

Since Optimism uses a fork of Geth, issues which are responsibly disclosed to upstream cannot be "replayed" against Optimism’s bug bounty program if the vulnerability has already been made public. If the vulnerability is disclosed to Optimism at the same time as upstream Geth, the vulnerability is eligible for the bug bounty program.

All smart contract bug reports must come with a PoC in order to be considered for a reward.

For KYC, OptimismPBC will request an invoice, with your name and address in order to payout the reward.

Critical vulnerabilities are further capped at 10% of economic damage, with the main consideration being the funds affected in addition to PR and brand considerations, at the discretion of the team. However, there is a minimum of USD 75 000 for Critical bug reports.

For testing any exploits involving cross-domain transactions, we recommend working with our dockerized services and modifying our integration tests

The following known issues are considered to be out of scope of this bug bounty program.

Known issues:

Blockchain / DLT:

When running in non-archive mode, op-geth has difficulty executing deep reorgs. We are working on a fix.

Smart Contracts:

  • There appears to be an obvious bug which would allow an attacker to withdraw a fake ERC20 token from L2 in exchange for a real ERC20 (such as WBTC) token on L1. There is no check in the L2StandardBridge, however the withdrawal is prevented from finalizing by a check in the L1StandardBridge. Naturally if you do find a way to circumvent our protections, then we would reward you.
  • The fact that their contracts are upgradable via a multisig.
  • A bug in ResolvedDelegateProxy.sol which could result in a storage slot key collision overwriting the address of the implementation. This bug is dependent on the layout of the implementation contract, and Optimism is not affected.
  • There is an edge case in which ETH deposited to the OptimismPortal by a contract can be irrecoverably stranded:
    • When a deposit transaction fails to execute, the sender’s account balance is still credited with the mint value. However, if the deposit’s L1 sender is a contract, the tx.origin on L2 will be aliased, and this aliased address will receive the minted on L2. In general the contract on L1 will not be able to recover these funds. We have documented this risk and encourage users to take advantage of our CrossDomainMessenger contracts which provide additional safety measures.
  • Sending cross-chain messages with very large amounts of data, or very specific amounts of gas can open up griefing attacks causing the sender’s funds to be stuck and requiring an upgrade to release them.
  • Deposit transactions can be griefed at a cost to the attacker, by filling up the MAX_RESOURCE_LIMIT. This issue is mitigated by PR 5064, which does not completely resolve the issue but does increase the cost of a sustained griefing attack. A more complete fix will require architectural changes.
  • There are various ‘foot guns’ in the bridge which may arise from misconfiguration of a token. To minimize complexity our bridge design does not try to prevent all forms of developer and user error. Examples of such foot guns include:
    • Having both (or neither of) the local and remote tokens be OptimismMintable.
    • Tokens which dynamically alter the amount of a token held by an account, such as fee-on-transfer and rebasing tokens.

Payouts are handled by the Optimism team directly and are denominated in USD. All payouts are done in USDC.

Program Overview

Optimism is a project dedicated to scaling Ethereum's technology and expanding its ability to coordinate people from across the world to build effective decentralized economies and governance systems.

The OP Stack is the modular, decentralized software stack that powers Optimism, forms the backbone of blockchains like OP Mainnet and Base, and is maintained by the Optimism Collective .

The first release of the OP Stack codebase is called Bedrock. The Bedrock release primarily consists of the core software required to run L2 blockchains and was originally designed to power an upgrade to the OP Mainnet network. Bedrock improves on its predecessor by reducing transaction fees using optimized batch compression and Ethereum as a data availability layer; shortening delays of including L1 transactions in rollups by handling L1 re-orgs more gracefully; enabling modular proof systems through code re-use; and improving node performance by removing technical debt.

To read more about Optimism, please visit https://www.optimism.io/. To learn about the OP Stack, please visit https://stack.optimism.io/.

This bounty program is focused on preventing:

  • theft of assets held in their smart contracts;
  • theft, freezing or other loss of funds due to vulnerabilities in the smart contracts’ or the critical blockchain client services (op-node and op-geth).

KYC required

The submission of KYC information is a requirement for payout processing.

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.

Total paid
Med. Resolution Time
1 day
Total Assets in Scope