This registry has not been significantly updated since 2020, and is no longer actively maintained. While some maintenance may be done to enhance or clarify the status of the current content, and pointers will be added to new work that is maintained such as the EEA EthTrust Security Levels Specification, new SWCs are no longer being added, and readers should check external sources to clarify the relevance of existing content.

All the work in here was incorporated into the EEA EthTrust Security Levels specification v1.

The EEA EthTrust Security Levels project is actively maintained. The Editor's draft for a new version is publicly available, is updated roughly every two weeks, and a formal release is expected to be published in Q4 2023 as version 2 of the specification.

The Smart Contract Weakness Classification Registry (SWC Registry) is an implementation of the weakness classification scheme proposed in EIP-1470. It is loosely aligned to the terminologies and structure used in the Common Weakness Enumeration (CWE) while overlaying a wide range of weakness variants that are specific to smart contracts.

The goals of this project are as follows:

• Provide a straightforward way to classify security issues in smart contract systems.
• Define a common language for describing security issues in smart contract systems' architecture, design, or code.
• Serve as a way to train and increase performance for smart contract security analysis tools.

SWCs are concerned with weaknesses that can be identified within Solidity code of a smart contract. Weaknesses in 'smart contract adjacent' code are not covered by this registry of Weaknesses. For example, the gas siphoning attack occurs in wallet code, and should be protected against in wallet code.