Static Analyzer for Solidity
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Latest commit 92e3578 Sep 21, 2018

Slither, the Solidity source analyzer

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Slither is a Solidity static analysis framework written in Python 3. It runs a suite of vulnerability detectors, prints visual information about contract details, and provides an API to easily write custom analyses. Slither enables developers to find vulnerabilities, enhance their code comphrehension, and quickly prototype custom analyses.


  • Detects vulnerable Solidity code with low false positives
    • Detection of most major smart contract vulnerabilities
    • Detection of poor coding practices
  • Identifies where the error condition occurs in the source code
  • Easy integration into continuous integration pipelines
  • Four built-in 'printers' quickly report crucial contract information
  • Detector API to write custom analyses in Python
  • Ability to analyze contracts written with Solidity > 0.4

Support for advanced value- and taint-tracking is coming soon!


$ slither tests/uninitialized.sol
INFO:Detectors:Uninitialized state variables in tests/uninitialized.sol, Contract: Uninitialized, Vars: destination, Used in ['transfer']

If Slither is run on a directory, it will run on every .sol file of the directory. All vulnerability checks are run by default.


  • --solc SOLC: Path to solc (default 'solc')
  • --solc-args SOLC_ARGS: Add custom solc arguments. SOLC_ARGS can contain multiple arguments
  • --disable-solc-warnings: Do not print solc warnings
  • --solc-ast: Use the solc AST file as input (solc file.sol --ast-json > file.ast.json)
  • --json FILE: Export results as JSON
  • --exclude-name: Excludes the detector name from analysis


  • --printer-summary: Print a summary of the contracts
  • --printer-quick-summary: Print a quick summary of the contracts
  • --printer-inheritance: Print the inheritance graph
  • --printer-vars-and-auth: Print the variables written and the check on msg.sender of each function

Checks available

By default, all the checks are run.

Check Purpose Impact Confidence
--detect-uninitialized-state Detect uninitialized state variables High High
--detect-uninitialized-storage Detect uninitialized storage variables High High
--detect-reentrancy Detect if different pragma directives are used High Medium
--detect-tx-origin Detect dangerous usage of tx.origin Medium Medium
--detect-pragma Detect if different pragma directives are used Informational High
--detect-solc-version Detect if an old version of Solidity is used (<0.4.23) Informational High

Contact us to get access to additional detectors.

How to install

Slither requires Python 3.6+ and solc, the Solidity compiler.

$ git clone & cd slither
$ python install 

Getting Help

Feel free to stop by our Slack channel for help using or extending Slither.


Slither is licensed and distributed under the AGPLv3 license. Contact us if you're looking for an exception to the terms.