Audit Tools

Mythril

Mythril is a symbolic execution analyzer for EVM bytecode and Solidity contracts that can find security-relevant execution paths.

Mythril explores possible contract paths to find bugs that normal tests may miss.

Mythril Explained in Detail

Mythril analyzes EVM contracts using symbolic execution. Instead of running one fixed input, it explores possible inputs and paths that may trigger risky behavior.

It can help find issues around authorization, arithmetic, low-level calls, assertions, and dangerous opcodes.

Smart contract example

myth analyze contracts/Vault.sol

The output is a lead for review, not final proof of exploitability.

Mythril in Auditing

Symbolic tools can reach paths that unit tests miss. They are useful during triage, especially when paired with manual review and concrete proof-of-concept tests.

Auditors should validate Mythril findings instead of accepting or rejecting them blindly.

Red flags in code

  • Findings are treated as automatically exploitable.

  • Path constraints are ignored.

  • The contract is analyzed without realistic deployment context.

  • External calls are modeled too simply.

  • Tool output replaces manual review.

How to test or review it

  • Run Mythril on relevant compiled contracts or bytecode.

  • Inspect traces and path constraints.

  • Reproduce important findings with a concrete test.

  • Compare findings with Slither and manual review.

  • Focus on reachability, impact, and exploit sequence.

Sources