Solidity Compiler Audit

The Augur team and the Ethereum Foundation (through a joint grant) asked us to review and audit the Solidity compiler. We looked at the code and now publish our results.

The audited project can be found in the ethereum/solidity GitHub repository. The version used for this report is commit e67f0147998a9e3835ed3ce8bf6a0a0c634216c5 (tag v0.4.24).

The full report can be found here, and a list of the issues ordered by severity can be found next.

Critical Severity

High Severity

Medium severity

Low severity



Two critical severity and ten high severity issues were found and explained, along with recommendations on how to fix them. Some additional changes were proposed to follow best practices and reduce potential attack surface.

Update: All critical and high severity issues were fixed or addressed by the Solidity team.

Note that as of the date of publishing, the above review reflects the current understanding of known security patterns as they relate to the Solidity compiler. We have not reviewed the Augur project. The above should not be construed as investment advice or an offering of tokens. For general information about smart contract security, check out our thoughts here.