Ensuring the security of the Flow Protocol is our utmost priority. We have dedicated significant efforts towards the design and testing of the protocol to guarantee its safety and reliability. However, we are aware that security is a continuous process.

Starting on Dec 1, 2024, the sablier-labs/flow repository is subject to the Sablier Bug Bounty (the "Program") to incentivize responsible bug disclosure.

We are limiting the scope of the Program to critical and high severity bugs, and are offering a reward of up to $100,000. Happy hunting!

The scope of the Program is limited to bugs that result in the draining of funds locked up in contracts.

The Program does NOT cover the following:

• Code located in the tests, precompiles and script directories.
• External code in node_modules, except for code that is explicitly used by a deployed contract located in the src directory.
• Contract deployments on test networks, such as Sepolia.
• Bugs in third-party contracts or platforms interacting with Sablier Flow.
• Previously reported or discovered vulnerabilities in contracts built by third parties on Sablier Flow.
• Bugs that have already been reported.

Vulnerabilities contingent upon the occurrence of any of the following also are outside the scope of this Program:

• Front-end bugs (clickjacking etc.)
• DDoS attacks
• Spamming
• Phishing
• Social engineering attacks
• Private key leaks
• Automated tools (Github Actions, etc.)
• Compromise or misuse of third party systems or services

Flow has been developed with a number of technical assumptions in mind. For a disclosure to qualify as a vulnerability, it must adhere to the following assumptions:

• The total supply of any ERC-20 token remains below $(2^{128} - 1)$, i.e., type(uint128).max.
• The transfer and transferFrom methods of any ERC-20 token strictly reduce the sender's balance by the transfer amount and increase the recipient's balance by the same amount. In other words, tokens that charge fees on transfers are not supported.
• An address' ERC-20 balance can only change as a result of a transfer call by the sender or a transferFrom call by an approved address. This excludes rebase tokens, interest-bearing tokens, and permissioned tokens where the admin can arbitrarily change balances.
• The token contract does not allow callbacks (e.g., ERC-777 is not supported).
• A trust relationship is formed between the sender, recipient, and depositors participating in a stream. The recipient depends on the sender to fulfill their obligation to repay any debts incurred by the Flow stream. Likewise, depositors trust that the sender will not abuse the refund function to reclaim tokens.
• The depletionTimeOf function depends on the stream's rate per second. Therefore, any change in the rate per second will result in a new depletion time.
• As explained in the Technical Documentation, there could be a minor discrepancy between the actual streamed amount and the expected amount. This is due to rps being an 18-decimal number, while users provide the amount per interval in the UI. If rps had infinite decimals, this discrepancy would not occur.

Rewards will be allocated based on the severity of the bug disclosed and will be evaluated and rewarded at the discretion of the Sablier Labs team. For critical bugs that lead to any loss of user funds, rewards of up to $100,000 will be granted. Lower severity bugs will be rewarded at the discretion of the team.

Any vulnerability or bug discovered must be reported only to the following email: [email protected].

The vulnerability must not be disclosed publicly or to any other person, entity or email address before Sablier Labs has been notified, has fixed the issue, and has granted permission for public disclosure. In addition, disclosure must be made within 24 hours following discovery of the vulnerability.

A detailed report of a vulnerability increases the likelihood of a reward and may increase the reward amount. Please provide as much information about the vulnerability as possible, including:

• The conditions on which reproducing the bug is contingent.
• The steps needed to reproduce the bug or, preferably, a proof of concept.
• The potential implications of the vulnerability being abused.

Anyone who reports a unique, previously-unreported vulnerability that results in a change to the code or a configuration change and who keeps such vulnerability confidential until it has been resolved by our engineers will be recognized publicly for their contribution if they so choose.

To qualify for a reward under this Program, you must adhere to the following criteria:

• Identify a previously unreported, non-public vulnerability that could result in the loss of any ERC-20 asset in Sablier Flow (but not on any third-party platform interacting with Sablier Flow) and that is within the scope of this Program.
• The vulnerability must be distinct from the issues covered in the Audits.
• Be the first to report the unique vulnerability to [email protected] in accordance with the disclosure requirements specified above. If multiple similar vulnerabilities are reported within a 24-hour timeframe, rewards will be split at the discretion of Sablier Labs.
• Provide sufficient information to enable our engineers to reproduce and fix the vulnerability.
• Not engage in any unlawful conduct when disclosing the bug, including through threats, demands, or any other coercive tactics.
• Avoid exploiting the vulnerability in any manner, such as making it public or profiting from it (aside from the reward offered under this Program).
• Make a genuine effort to prevent privacy violations, data destruction, and any interruption or degradation of Sablier Flow.
• Submit only one vulnerability per submission, unless chaining vulnerabilities is necessary to demonstrate the impact of any of them.
• Do not submit a vulnerability that stems from an underlying issue for which a reward has already been paid under this Program.
• You must not be a current or former employee, vendor, or contractor of Sablier Labs, or an employee of any of its vendors or contractors.
• You must not be subject to UK sanctions or reside in a UK-embargoed country.
• Be at least 18 years old, or if younger, submit the vulnerability with the consent of a parent or guardian.

By submitting your report, you grant Sablier Labs any and all rights, including intellectual property rights, needed to validate, mitigate, and disclose the vulnerability. All reward decisions, including eligibility for and amounts of the rewards and the manner in which such rewards will be paid, are made at our sole discretion.

The terms and conditions of this Program may be altered at any time.