CodeSAGE: A multi-feature fusion vulnerability detection approach using code attribute graphs and attention mechanisms

Software supply chain security is a critical aspect of modern computer security, with vulnerabilities being a significant threats. Identifying and patching these vulnerabilities promptly can significantly reduce security risks. Traditional detection methods cannot fully capture the complex structure of source code, leading to low accuracy. The neural network capacity limits machine learning-based methods, hindering effective feature extraction and impacting performance. In this paper, we propose a multi-feature fusion vulnerability detection technique called CodeSAGE. The method utilizes the Code Property Graph (CPG)1 to comprehensively display multiple logical structural relationships in the source code and combine it with GraphSAGE to aggregate the information of neighboring nodes in CPG to extract local features of the source code. Meanwhile, a Bi-LSTM combined with the attention mechanism is utilized to capture long-range dependencies in the logical structure of the source code and extract global features. The attention mechanism is used to assign weights to the two features, which are then fused to represent the syntactic and semantic information of the source code for vulnerability detection. A method for simplifying the CPG is proposed to mitigate the impact of graph size on model runtime and reduce redundant feature information. Irrelevant nodes are removed by weighting different edge types and filtering nodes exceeding a certain threshold, reducing the CPG size. To verify the effectiveness of CodeSAGE, comparative experiments are conducted on the SARD and CodeXGLUE datasets. The experimental results show that the CPG size can be reduced by 25%-45% using the simplified method, with an average time reduction of 20% per training round. Detection accuracy reached 99.12% on the SARD dataset and 73.57% on the CodeXGLUE dataset, outperforming the comparison methods.