Josselin Feist

Blockchain Security Researcher


Former Trail of Bits Engineering Director – Author of Slither


🧾 Audit Portfolio

The folllowing contains example of public security reviews I have participated in.

Defi

Year Protocol Description Report Link
2024 Uniswap V4 AMM Link
2024 Balancer V3 AMM Link
2023 BlueFin (Move/SUI) Perpetual swap Link
2023 Mass.money Tetris VM Link
2023 Mass.money Account abstraction, vesting, on-chain DCA Link
2022 Folksfinance (Algorand) Lending protocol Link
2021 Balancer V2 AMM Link
2020 Balancer core AMM Link
2020 Curve dao Governance for Stablecoin AMM Link
2020 Curve Stablecoin AMM Link
2020 StakerDAO (Algorand) Vault Link
2020 Dexter (Tezos) AMM on Tezos Link
2019 Computable Data marketplace protocol Link
2019 Flexa Staking Link
2018 Basis Stablecoin Link
2018 Gemini Stablecoin Link
2018 Origin Marketplace protocol Link
2018 Parity Multisig wallet Link
2017 Sai Stablecoin Link
2017 Dapphub Smart contract library Link

Blockchain Protocols

Year Name Description Report Link
2024 Offchain BoLD Fixes L2 bridge + dispute resolution Link
2022 Offchain Nitro L2 rollup Link
2020 Hermez L2 rollup Link
2019 Centrifuge Asset tokenization chain Link
2017 RSKj Bitcoin sidechain client Link

Non-public reviews include:

🐞 Vulnerabilities Disclosure

Year Project Description Link
2020 Tezos Callback authorization bypass & Callback injection Post
2020 Aave Selfdestruct through uninitialized proxy Blog
2020 Vyper Function collision Github, Blog
2020 E&Y’gs Nightfall Unused return value allows minting free tokens N/A
2020 DOSNetwork ABI encodePacked Collision N/A
2020 EthKids Msg.value reused N/A
2019 Kleros Array’s length overwrite allows arbitrary write N/A
2017 Gitcoin Lack of check on ERC20 return value Github

Non-Blockchain Disclosures

Year Project CVE Description Link
2016 Giflib CVE-2016-3177 Use after free and double free Link
2015 Jasper-JPEG-200 CVE-2015-5221 Use after Free Link
2016 Alsabat N/A Use after free Link
2015 Openjpeg CVE-2015-8871 Use after free Link
2015 Gnome-nettool N/A Use after free Link
2015 Accel-ppp N/A Use after free Link