Gnosis Chain

Back to Explore Gnosis Chain Gnosis Chain is an EVM compatible, community-owned network that prioritizes credible neutrality and resiliency, open to everyone without privilege or prejudice. Secured by over 165k validators around the world, Gnosis Chain has all the tooling you are used to and trust-minimized bridges to mainnet. BSC ETH Defi Crosschain Liquidity L1 Solidity Maximum Bounty $2,000,000 Live Since 11 February 2022 Last Updated 09 October 2026 PoC Required Submit a Bug Information Scope Resources Rewards Gnosis Chain provides rewards in USDC or xDAI on Ethereum, Base , denominated in USD. Rewards by Threat Level Smart Contract Critical Max: $2,000,000 Min: $50,000 Primacy of Rules High Max: $50,000 Min: $10,000 Primacy of Rules Medium Max: $10,000 Min: $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 Minimum reward to discourage security researchers from withholding a bug report: $50,000 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 smart contract bug reports must come with a PoC with an end-effect impacting an asset-in-scope in order to be considered for a reward. Critical and High smart contract vulnerabilities are capped at 10% of economic damage, primarily taking into consideration funds at risk, but also PR and branding aspects, at the discretion of the team. Payouts are handled by the Gnosis Chain team directly and are denominated in USD . However, payouts are done in USDC or xDAI . View impacts in scope Program Overview Gnosis Chain is an EVM compatible, community-owned network that prioritizes credible neutrality and resiliency, open to everyone without privilege or prejudice. Secured by over 165k validators around the world, Gnosis Chain has all the tooling you are used to and trust-minimized bridges to mainnet. For more information about Gnosis Chain, please visit https://www.gnosis.io/ . This bug bounty program is focused on the bridges smart contracts that move assets in between Mainnet and Gnosis chain. The xDai bridge is used to bridge DAI on mainnet and the native xDai coin on Gnosis chain. For more information see https://docs.gnosischain.com/bridges/tokenbridge/xdai-bridge . The OmniBridge is a native token bridge that mints the canonical representation of bridged assets on Gnosis. For more information see https://docs.gnosischain.com/bridges/tokenbridge/omnibridge . Disclosure of Information relating to Bug Reports: Security researchers may not publish any information about their bug reports (even after any vulnerabilities have been fixed and the security researcher has been paid) unless Gnosis provides written consent in the bug report submission thread. Known Issues Category Description / Link Last Updated At Smart Contract │ callback through onTokenBridged() is not checked for success. Any failure in onTokenBridged() is silently swallowed. 9 September 2026 Smart Contract │ Validator signature collection on Home uses a static validator set defined at the time of transaction execution while signature verification uses the currently active validator set (potentially updated). 9 September 2026 Smart Contract │ Omnibridge onTokenTransfer() function does not verify msg.sender and anyone can call this function to create fake bridge token. 9 September 2026 Smart Contract │ The minter allowance granted by tokens to the USDCTransmuter can be exhausted to prevent successful USDC.e and EURC.e transfers. 9 September 2026 Category Smart Contract Description / Link callback through onTokenBridged() is not checked for success. Any failure in onTokenBridged() is silently swallowed. Last Updated At 9 September 2026 Category Smart Contract Description / Link Validator signature collection on Home uses a static validator set defined at the time of transaction execution while signature verification uses the currently active validator set (potentially updated). Last Updated At 9 September 2026 Category Smart Contract Description / Link Omnibridge onTokenTransfer() function does not verify msg.sender and anyone can call this function to create fake bridge token. Last Updated At 9 September 2026 Category Smart Contract Description / Link The minter allowance granted by tokens to the USDCTransmuter can be exhausted to prevent successful USDC.e and EURC.e transfers. Last Updated At 9 September 2026 KYC not required No KYC information is required for payout processing. Proof of Concept Proof of concept is always required for all severities. 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 paid 25.9k Med. Resolution Time 1 day Total Assets in Scope 4