Bug Bounty

Program Overview

The bug bounty program covers the Solend smart contracts (no UI bugs) and is focused on preventing thefts and freezing of funds.

The Solend smart contracts are fully open source.


Rewards are distributed according to the following classifications:

Severity is classified by the following:

The actual prize amount is determined by a combination of factors including but not limited to severity, value at risk, and likelihood of being exploited.

Payouts are done in vesting SLND on Solana. This is anon-friendly (no KYC required).


Email us a detailed description of the attack at security@solend.fi. Critical and High bug reports must come with a proof of concept.


Assets in Scope

Smart contract code

The main file of the lending program is here.

Impacts in Scope

Only the following impacts are accepted within this bug bounty program. All other impacts are not considered as in-scope, even if they affect the assets in the scope table.

Smart Contracts

  • Loss of user funds staked (principal) by freezing or theft

  • Loss of governance funds

  • Theft of unclaimed yield

  • Freezing of unclaimed yield

  • Temporary freezing of funds for at least 1 hour

  • Unable to call smart contract

Known Issues (not qualified)

Bug reports involving position limit, where a user can only have so many positions before actions fail due to the computation limit, are not accepted in this bug bounty program.

Bug reports involving borrow limit, where a user can borrow even when the limit is set, are not accepted in this bug bounty program.

Prioritized Vulnerabilities

We are especially interested in receiving and rewarding vulnerabilities of the following types:

Smart Contracts and Blockchain

  • Re-entrancy

  • Logic errors

    • Including user authentication errors

  • Trust/dependency vulnerabilities

    • Composability vulnerabilities

  • Oracle failure/manipulation

  • Novel governance attacks

  • Economic/financial attacks

    • Flash loan attacks

  • Congestion and scalability

    • Running out of gas

    • Block stuffing

    • Susceptibility to front-running

  • Consensus failures

  • Cryptography problems

    • Signature malleability

    • Susceptibility to replay attacks

    • Weak randomness

    • Weak encryption

  • Susceptibility to block timestamp manipulation

  • Missing access controls / unprotected internal or debugging interfaces

Out of Scope Rules

The following vulnerabilities are excluded from the rewards for this bug bounty program:

  • Attacks that the reporter has already exploited themselves, leading to damage

  • Attacks requiring access to leaked keys/credentials

  • Attacks requiring access to privileged addresses (governance, strategist)

Smart Contracts and Blockchain

  • Incorrect data supplied by third party oracles

    • Not to exclude oracle manipulation/flash loan attacks

  • Basic economic governance attacks (e.g. 51% attack)

  • Lack of liquidity

  • Best practice critiques

  • Sybil attacks

The following activities are prohibited by this bug bounty program:

  • Any testing with mainnet contracts; all testing should be done on devnet or private testnets

  • Any testing with live pricing oracles or live 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

  • Automated testing of services that generates significant amounts of traffic

  • Public disclosure of an unpatched vulnerability in an embargoed bounty

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