How GitLab tracks vulnerabilities through refactors and reformatting

GitLab’s normalized Scope+Offset vulnerability-tracking method improves security scan consistency by identifying findings according to their enclosing code scope and position while disregarding comments and blank lines. The earlier Scope+Offset approach reduced unnecessary re-auditing compared with file-and-line tracking, but non-functional edits could still shift offsets and create duplicate findings. In a benchmark spanning 439 files in seven languages and 2,247 deliberately disruptive commits, the original method generated 1,361 duplicate fingerprints, whereas the normalized method generated none and reduced unique fingerprints by 43%. Available in GitLab as the scope_offset_compressed algorithm, the approach supports several major programming languages, does not affect scanning time because it reuses existing parse trees, and remains compatible with heterogeneous SAST tool configurations.

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