SecRewardFL: A Reward-Guided Multi-Model System for Software Security Vulnerability Localization

SecRewardFL is an intelligent system that uses reward-guided mechanisms and multi-model collaboration for software security vulnerability localization, aiming to address the problem of balancing precision and recall in traditional vulnerability detection tools. This system combines multiple specialized models, adjusts the contribution weights of models through a dynamic reward mechanism, and explores a new paradigm for security analysis in the era of large models.

Traditional vulnerability localization faces issues such as low efficiency of manual auditing, high false positives in static analysis, and limited coverage in dynamic analysis. The emergence of large language models has brought new possibilities for security analysis—they possess code semantic understanding and reasoning capabilities, but general-purpose models lack professional training in the security domain, and a single model is difficult to cover multi-step reasoning requirements.

The core of the system is reward-guided multi-model security reasoning: 1. Reward mechanism: Dynamically adjust model weights based on intermediate results, positively reward models with excellent performance, and suppress incorrect judgments; 2. Multi-model collaboration: Divide tasks according to vulnerability types (e.g., memory safety, injection) or analysis stages (screening, confirmation, evaluation), leveraging the expertise of each model to improve overall performance.

At the technical level, the following need to be addressed: 1. Code representation: Encode structured information such as AST and CFG into model inputs; 2. Context understanding: Capture dependencies across functions/files; 3. Localization precision: Pursue fine-grained (code line-level) localization to enhance practical value.

The system can be applied in: 1. Software development phase: Integrate into CI/CD processes for automatic code review; 2. Code auditing: Act as an expert assistant to prioritize scanning high-risk areas; 3. Open-source software security: Assist communities in reviewing projects; 4. Security education: Help learners understand vulnerability characteristics.

Current limitations include high false positive rates, insufficient coverage of new vulnerabilities, and poor decision interpretability. Future directions: Combine program analysis techniques to improve precision, use active learning to reduce annotation dependencies, explore multimodal methods, and enhance interpretability technologies.