**Slither** is a Solidity & Vyper static analysis framework written in Python3. 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 comprehension, and quickly prototype custom analyses.
If you're **not** going to use one of the [supported compilation frameworks](https://github.com/crytic/crytic-compile), you need [solc](https://github.com/ethereum/solidity/), the Solidity compiler; we recommend using [solc-select](https://github.com/crytic/solc-select) to conveniently switch between solc versions.
We recommend using a Python virtual environment, as detailed in the [Developer Installation Instructions](https://github.com/trailofbits/slither/wiki/Developer-installation), if you prefer to install Slither via git.
### Using Docker
Use the [`eth-security-toolbox`](https://github.com/trailofbits/eth-security-toolbox/) docker image. It includes all of our security tools and every major version of Solidity in a single image. `/home/share` will be mounted to `/share` in the container.
```bash
docker pull trailofbits/eth-security-toolbox
```
To share a directory in the container:
```bash
docker run -it -v /home/share:/share trailofbits/eth-security-toolbox
* For GitHub action integration, use [slither-action](https://github.com/marketplace/actions/slither-action).
* To generate a Markdown report, use `slither [target] --checklist`.
* To generate a Markdown with GitHub source code highlighting, use `slither [target] --checklist --markdown-root https://github.com/ORG/REPO/blob/COMMIT/` (replace `ORG`, `REPO`, `COMMIT`)
3 | `array-by-reference` | [Modifying storage array by value](https://github.com/crytic/slither/wiki/Detector-Documentation#modifying-storage-array-by-value) | High | High
4 | `encode-packed-collision` | [ABI encodePacked Collision](https://github.com/crytic/slither/wiki/Detector-Documentation#abi-encodePacked-collision) | High | High
5 | `incorrect-shift` | [The order of parameters in a shift instruction is incorrect.](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-shift-in-assembly) | High | High
6 | `multiple-constructors` | [Multiple constructor schemes](https://github.com/crytic/slither/wiki/Detector-Documentation#multiple-constructor-schemes) | High | High
7 | `name-reused` | [Contract's name reused](https://github.com/crytic/slither/wiki/Detector-Documentation#name-reused) | High | High
8 | `protected-vars` | [Detected unprotected variables](https://github.com/crytic/slither/wiki/Detector-Documentation#protected-variables) | High | High
9 | `public-mappings-nested` | [Public mappings with nested variables](https://github.com/crytic/slither/wiki/Detector-Documentation#public-mappings-with-nested-variables) | High | High
10 | `rtlo` | [Right-To-Left-Override control character is used](https://github.com/crytic/slither/wiki/Detector-Documentation#right-to-left-override-character) | High | High
11 | `shadowing-state` | [State variables shadowing](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variable-shadowing) | High | High
12 | `suicidal` | [Functions allowing anyone to destruct the contract](https://github.com/crytic/slither/wiki/Detector-Documentation#suicidal) | High | High
13 | `uninitialized-state` | [Uninitialized state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-state-variables) | High | High
14 | `uninitialized-storage` | [Uninitialized storage variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-storage-variables) | High | High
15 | `unprotected-upgrade` | [Unprotected upgradeable contract](https://github.com/crytic/slither/wiki/Detector-Documentation#unprotected-upgradeable-contract) | High | High
16 | `codex` | [Use Codex to find vulnerabilities.](https://github.com/crytic/slither/wiki/Detector-Documentation#codex) | High | Low
17 | `arbitrary-send-erc20-permit` | [transferFrom uses arbitrary from with permit](https://github.com/crytic/slither/wiki/Detector-Documentation#arbitrary-from-in-transferfrom-used-with-permit) | High | Medium
18 | `arbitrary-send-eth` | [Functions that send Ether to arbitrary destinations](https://github.com/crytic/slither/wiki/Detector-Documentation#functions-that-send-ether-to-arbitrary-destinations) | High | Medium
19 | `controlled-array-length` | [Tainted array length assignment](https://github.com/crytic/slither/wiki/Detector-Documentation#array-length-assignment) | High | Medium
20 | `controlled-delegatecall` | [Controlled delegatecall destination](https://github.com/crytic/slither/wiki/Detector-Documentation#controlled-delegatecall) | High | Medium
21 | `delegatecall-loop` | [Payable functions using `delegatecall` inside a loop](https://github.com/crytic/slither/wiki/Detector-Documentation/#payable-functions-using-delegatecall-inside-a-loop) | High | Medium
22 | `incorrect-exp` | [Incorrect exponentiation](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-exponentiation) | High | Medium
23 | `incorrect-return` | [If a `return` is incorrectly used in assembly mode.](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-return-in-assembly) | High | Medium
24 | `msg-value-loop` | [msg.value inside a loop](https://github.com/crytic/slither/wiki/Detector-Documentation/#msgvalue-inside-a-loop) | High | Medium
25 | `reentrancy-eth` | [Reentrancy vulnerabilities (theft of ethers)](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities) | High | Medium
26 | `return-leave` | [If a `return` is used instead of a `leave`.](https://github.com/crytic/slither/wiki/Detector-Documentation#return-instead-of-leave-in-assembly) | High | Medium
27 | `storage-array` | [Signed storage integer array compiler bug](https://github.com/crytic/slither/wiki/Detector-Documentation#storage-signed-integer-array) | High | Medium
28 | `unchecked-transfer` | [Unchecked tokens transfer](https://github.com/crytic/slither/wiki/Detector-Documentation#unchecked-transfer) | High | Medium
29 | `weak-prng` | [Weak PRNG](https://github.com/crytic/slither/wiki/Detector-Documentation#weak-PRNG) | High | Medium
30 | `domain-separator-collision` | [Detects ERC20 tokens that have a function whose signature collides with EIP-2612's DOMAIN_SEPARATOR()](https://github.com/crytic/slither/wiki/Detector-Documentation#domain-separator-collision) | Medium | High
31 | `enum-conversion` | [Detect dangerous enum conversion](https://github.com/crytic/slither/wiki/Detector-Documentation#dangerous-enum-conversion) | Medium | High
32 | `erc20-interface` | [Incorrect ERC20 interfaces](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-erc20-interface) | Medium | High
33 | `erc721-interface` | [Incorrect ERC721 interfaces](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-erc721-interface) | Medium | High
34 | `incorrect-equality` | [Dangerous strict equalities](https://github.com/crytic/slither/wiki/Detector-Documentation#dangerous-strict-equalities) | Medium | High
35 | `locked-ether` | [Contracts that lock ether](https://github.com/crytic/slither/wiki/Detector-Documentation#contracts-that-lock-ether) | Medium | High
36 | `mapping-deletion` | [Deletion on mapping containing a structure](https://github.com/crytic/slither/wiki/Detector-Documentation#deletion-on-mapping-containing-a-structure) | Medium | High
37 | `shadowing-abstract` | [State variables shadowing from abstract contracts](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variable-shadowing-from-abstract-contracts) | Medium | High
38 | `tautological-compare` | [Comparing a variable to itself always returns true or false, depending on comparison](https://github.com/crytic/slither/wiki/Detector-Documentation#tautological-compare) | Medium | High
39 | `tautology` | [Tautology or contradiction](https://github.com/crytic/slither/wiki/Detector-Documentation#tautology-or-contradiction) | Medium | High
40 | `write-after-write` | [Unused write](https://github.com/crytic/slither/wiki/Detector-Documentation#write-after-write) | Medium | High
41 | `boolean-cst` | [Misuse of Boolean constant](https://github.com/crytic/slither/wiki/Detector-Documentation#misuse-of-a-boolean-constant) | Medium | Medium
42 | `constant-function-asm` | [Constant functions using assembly code](https://github.com/crytic/slither/wiki/Detector-Documentation#constant-functions-using-assembly-code) | Medium | Medium
43 | `constant-function-state` | [Constant functions changing the state](https://github.com/crytic/slither/wiki/Detector-Documentation#constant-functions-changing-the-state) | Medium | Medium
44 | `divide-before-multiply` | [Imprecise arithmetic operations order](https://github.com/crytic/slither/wiki/Detector-Documentation#divide-before-multiply) | Medium | Medium
45 | `out-of-order-retryable` | [Out-of-order retryable transactions](https://github.com/crytic/slither/wiki/Detector-Documentation#out-of-order-retryable-transactions) | Medium | Medium
46 | `reentrancy-no-eth` | [Reentrancy vulnerabilities (no theft of ethers)](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-1) | Medium | Medium
47 | `reused-constructor` | [Reused base constructor](https://github.com/crytic/slither/wiki/Detector-Documentation#reused-base-constructors) | Medium | Medium
48 | `tx-origin` | [Dangerous usage of `tx.origin`](https://github.com/crytic/slither/wiki/Detector-Documentation#dangerous-usage-of-txorigin) | Medium | Medium
49 | `unchecked-lowlevel` | [Unchecked low-level calls](https://github.com/crytic/slither/wiki/Detector-Documentation#unchecked-low-level-calls) | Medium | Medium
50 | `unchecked-send` | [Unchecked send](https://github.com/crytic/slither/wiki/Detector-Documentation#unchecked-send) | Medium | Medium
51 | `uninitialized-local` | [Uninitialized local variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-local-variables) | Medium | Medium
52 | `unused-return` | [Unused return values](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-return) | Medium | Medium
53 | `incorrect-modifier` | [Modifiers that can return the default value](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-modifier) | Low | High
54 | `shadowing-builtin` | [Built-in symbol shadowing](https://github.com/crytic/slither/wiki/Detector-Documentation#builtin-symbol-shadowing) | Low | High
56 | `uninitialized-fptr-cst` | [Uninitialized function pointer calls in constructors](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-function-pointers-in-constructors) | Low | High
57 | `variable-scope` | [Local variables used prior their declaration](https://github.com/crytic/slither/wiki/Detector-Documentation#pre-declaration-usage-of-local-variables) | Low | High
58 | `void-cst` | [Constructor called not implemented](https://github.com/crytic/slither/wiki/Detector-Documentation#void-constructor) | Low | High
59 | `calls-loop` | [Multiple calls in a loop](https://github.com/crytic/slither/wiki/Detector-Documentation/#calls-inside-a-loop) | Low | Medium
65 | `reentrancy-events` | [Reentrancy vulnerabilities leading to out-of-order Events](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-3) | Low | Medium
66 | `return-bomb` | [A low level callee may consume all callers gas unexpectedly.](https://github.com/crytic/slither/wiki/Detector-Documentation#return-bomb) | Low | Medium
67 | `timestamp` | [Dangerous usage of `block.timestamp`](https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp) | Low | Medium
68 | `assembly` | [Assembly usage](https://github.com/crytic/slither/wiki/Detector-Documentation#assembly-usage) | Informational | High
69 | `assert-state-change` | [Assert state change](https://github.com/crytic/slither/wiki/Detector-Documentation#assert-state-change) | Informational | High
70 | `boolean-equal` | [Comparison to boolean constant](https://github.com/crytic/slither/wiki/Detector-Documentation#boolean-equality) | Informational | High
71 | `cyclomatic-complexity` | [Detects functions with high (> 11) cyclomatic complexity](https://github.com/crytic/slither/wiki/Detector-Documentation#cyclomatic-complexity) | Informational | High
74 | `function-init-state` | [Function initializing state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#function-initializing-state) | Informational | High
75 | `incorrect-using-for` | [Detects using-for statement usage when no function from a given library matches a given type](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-using-for-usage) | Informational | High
77 | `missing-inheritance` | [Missing inheritance](https://github.com/crytic/slither/wiki/Detector-Documentation#missing-inheritance) | Informational | High
78 | `naming-convention` | [Conformity to Solidity naming conventions](https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions) | Informational | High
79 | `pragma` | [If different pragma directives are used](https://github.com/crytic/slither/wiki/Detector-Documentation#different-pragma-directives-are-used) | Informational | High
80 | `redundant-statements` | [Redundant statements](https://github.com/crytic/slither/wiki/Detector-Documentation#redundant-statements) | Informational | High
84 | `unused-state` | [Unused state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-state-variable) | Informational | High
85 | `costly-loop` | [Costly operations in a loop](https://github.com/crytic/slither/wiki/Detector-Documentation#costly-operations-inside-a-loop) | Informational | Medium
86 | `dead-code` | [Functions that are not used](https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code) | Informational | Medium
87 | `reentrancy-unlimited-gas` | [Reentrancy vulnerabilities through send and transfer](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-4) | Informational | Medium
88 | `too-many-digits` | [Conformance to numeric notation best practices](https://github.com/crytic/slither/wiki/Detector-Documentation#too-many-digits) | Informational | Medium
89 | `cache-array-length` | [Detects `for` loops that use `length` member of some storage array in their loop condition and don't modify it.](https://github.com/crytic/slither/wiki/Detector-Documentation#cache-array-length) | Optimization | High
90 | `constable-states` | [State variables that could be declared constant](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-constant) | Optimization | High
91 | `external-function` | [Public function that could be declared external](https://github.com/crytic/slither/wiki/Detector-Documentation#public-function-that-could-be-declared-external) | Optimization | High
92 | `immutable-states` | [State variables that could be declared immutable](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-immutable) | Optimization | High
93 | `var-read-using-this` | [Contract reads its own variable using `this`](https://github.com/crytic/slither/wiki/Detector-Documentation#public-variable-read-in-external-context) | Optimization | High
* The [Detector Documentation](https://github.com/crytic/slither/wiki/Detector-Documentation) for details on each detector
* The [Detection Selection](https://github.com/crytic/slither/wiki/Usage#detector-selection) to run only selected detectors. By default, all the detectors are run.
* The [Triage Mode](https://github.com/crytic/slither/wiki/Usage#triage-mode) to filter individual results
*`human-summary`: [Print a human-readable summary of the contracts](https://github.com/trailofbits/slither/wiki/Printer-documentation#human-summary)
*`inheritance-graph`: [Export the inheritance graph of each contract to a dot file](https://github.com/trailofbits/slither/wiki/Printer-documentation#inheritance-graph)
*`contract-summary`: [Print a summary of the contracts](https://github.com/trailofbits/slither/wiki/Printer-documentation#contract-summary)
*`loc`: [Count the total number lines of code (LOC), source lines of code (SLOC), and comment lines of code (CLOC) found in source files (SRC), dependencies (DEP), and test files (TEST).](https://github.com/trailofbits/slither/wiki/Printer-documentation#loc)
*`call-graph`: [Export the call-graph of the contracts to a dot file](https://github.com/trailofbits/slither/wiki/Printer-documentation#call-graph)
*`cfg`: [Export the CFG of each functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#cfg)
*`function-summary`: [Print a summary of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#function-summary)
*`vars-and-auth`: [Print the state variables written and the authorization of the functions](https://github.com/crytic/slither/wiki/Printer-documentation#variables-written-and-authorization)
*`not-pausable`: [Print functions that do not use `whenNotPaused` modifier](https://github.com/trailofbits/slither/wiki/Printer-documentation#when-not-paused).
* The [Printer documentation](https://github.com/trailofbits/slither/wiki/Printer-documentation) describes the information Slither is capable of visualizing for each contract.
Slither is licensed and distributed under the AGPLv3 license. [Contact us](mailto:opensource@trailofbits.com) if you're looking for an exception to the terms.
[MPro: Combining Static and Symbolic Analysis forScalable Testing of Smart Contract](https://arxiv.org/pdf/1911.00570.pdf) | Leverage data dependency through Slither | William Zhang, Sebastian Banescu, Leodardo Pasos, Steven Stewart, Vijay Ganesh | ISSRE 2019 | [MPro](https://github.com/QuanZhang-William/M-Pro)
[ETHPLOIT: From Fuzzing to Efficient Exploit Generation against Smart Contracts](https://wcventure.github.io/FuzzingPaper/Paper/SANER20_ETHPLOIT.pdf) | Leverage data dependency through Slither | Qingzhao Zhang, Yizhuo Wang, Juanru Li, Siqi Ma | SANER 20 | -
[Verification of Ethereum Smart Contracts: A Model Checking Approach](http://www.ijmlc.org/vol10/977-AM0059.pdf) | Symbolic execution built on top of Slither’s CFG | Tam Bang, Hoang H Nguyen, Dung Nguyen, Toan Trieu, Tho Quan | IJMLC 20 | -
[Demystifying Loops in Smart Contracts](https://www.microsoft.com/en-us/research/uploads/prod/2020/08/loops_solidity__camera_ready-5f3fec3f15c69.pdf) | Leverage data dependency through Slither | Ben Mariano, Yanju Chen, Yu Feng, Shuvendu Lahiri, Isil Dillig | ASE 20 | -
[Trace-Based Dynamic Gas Estimation of Loops in Smart Contracts](https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9268144) | Use Slither’s CFG to detect loops | Chunmiao Li, Shijie Nie, Yang Cao, Yijun Yu, Zhenjiang Hu | IEEE Open J. Comput. Soc. 1 (2020) | -
[SolType: Refinement Types for Arithmetic Overflow in Solidity](https://arxiv.org/abs/2110.00677) | Use Slither as frontend to build refinement type system | Bryan Tan, Benjamin Mariano, Shuvendu K. Lahiri, Isil Dillig, Yu Feng | POPL 22 | -
[Do Not Rug on Me: Leveraging Machine Learning Techniques for Automated Scam Detection](https://www.mdpi.com/2227-7390/10/6/949) | Use Slither to extract tokens' features (mintable, pausable, ..) | Mazorra, Bruno, Victor Adan, and Vanesa Daza | Mathematics 10.6 (2022) | -
[MANDO: Multi-Level Heterogeneous Graph Embeddings for Fine-Grained Detection of Smart Contract Vulnerabilities](https://arxiv.org/abs/2208.13252) | Use Slither to extract the CFG and call graph | Hoang Nguyen, Nhat-Minh Nguyen, Chunyao Xie, Zahra Ahmadi, Daniel Kudendo, Thanh-Nam Doan and Lingxiao Jiang| IEEE 9th International Conference on Data Science and Advanced Analytics (DSAA, 2022) | [ge-sc](https://github.com/MANDO-Project/ge-sc)
[Automated Auditing of Price Gouging TOD Vulnerabilities in Smart Contracts](https://www.cs.toronto.edu/~fanl/papers/price-icbc22.pdf) | Use Slither to extract the CFG and data dependencies| Sidi Mohamed Beillahi, Eric Keilty, Keerthi Nelaturu, Andreas Veneris, and Fan Long | 2022 IEEE International Conference on Blockchain and Cryptocurrency (ICBC) | [Smart-Contract-Repair](https://github.com/Veneris-Group/TOD-Location-Rectification)
[Modeling and Enforcing Access Control Policies for Smart Contracts](https://publikationen.bibliothek.kit.edu/1000152805/151859658) | Extend Slither's data dependencies | Jan-Philipp Toberg, Jonas Schiffl, Frederik Reiche, Bernhard Beckert, Robert Heinrich, Ralf Reussner | IEEE International Conference on Decentralized Applications and Infrastructures (DAPPS), 2022 | [SolidityAccessControlEnforcement](https://github.com/KASTEL-CSSDA/SolidityAccessControlEnforcement)
[Smart Contract Vulnerability Detection Based on Deep Learning and Multimodal Decision Fusion](https://www.mdpi.com/1424-8220/23/16/7246) | Use Slither to extract the CFG | Weichu Deng, Huanchun Wei, Teng Huang, Cong Cao, Yun Peng, and Xuan Hu | Sensors 2023, 23, 7246 | -
[Semantic-enriched Code Knowledge Graph to Reveal Unknowns in Smart Contract Code Reuse](https://www.researchgate.net/profile/Qing-Huang-26/publication/370638129_Semantic-enriched_Code_Knowledge_Graph_to_Reveal_Unknowns_in_Smart_Contract_Code_Reuse/links/645b7b8639c408339b3a54da/Semantic-Enriched-Code-Knowledge-Graph-to-Reveal-Unknowns-in-Smart-Contract-Code-Reuse.pdf) | Use Slither to extract the code features (CFG, function, parameters types, ..) | Qing Huang, Dianshu Liao, Zhenchang Xing, Zhengkang Zuo, Changjing Wang, Xin Xia | ACM Transactions on Software Engineering and Methodology, 2023 | -
[Smart Contract Parallel Execution with Fine-Grained State Accesses](https://personal.ntu.edu.sg/yi_li/files/Qi2023SCP.pdf) | Use Slither to build state access graphs | Xiaodong Qi, Jiao Jiao, Yi Li | International Conference on Distributed Computing Systems (ICDCS), 2023 | -
[Bad Apples: Understanding the Centralized Security Risks in Decentralized Ecosystems](https://diaowenrui.github.io/paper/www23-yan.pdf) | Implement an internal analysis on top of Slither | Kailun Yan , Jilian Zhang , Xiangyu Liu , Wenrui Diao , Shanqing Guo | ACM Web Conference April 2023 | -
[Identifying Vulnerabilities in Smart Contracts using Interval Analysis](https://arxiv.org/pdf/2309.13805.pdf) | Create 4 detectors on top of Slither | Ştefan-Claudiu Susan, Andrei Arusoaie | FROM 2023 | -
Storage State Analysis and Extraction of Ethereum Blockchain Smart Contracts (no PDF in open access) | Rely on Slither's CFG and AST | Maha Ayub , Tania Saleem , Muhammad Janjua , Talha Ahmad | TOSEM 2023 | [SmartMuv](https://github.com/WaizKhan7/SmartMuv)
If you are using Slither on an academic work, consider applying to the [Crytic $10k Research Prize](https://blog.trailofbits.com/2019/11/13/announcing-the-crytic-10k-research-prize/).
