GitLab Duo Security Review spots logic flaws scanners miss (opens in new tab)
GitLab’s Duo Security Review uses AI-driven reasoning to identify authorization gaps, data exposure, business-logic errors, and race conditions that pattern-based scanners often miss. It reviews merge requests in context, validates findings to reduce false positives, and reports issues before they reach production. The feature complements—not replaces—automated scanners and human security review. ## Where Traditional Scanners Fall Short - Static scanners detect recognizable patterns such as unsanitized inputs, secrets, and unsafe deserialization. - Logic flaws depend on application-specific context, including: - Broken object- or function-level authorization - Sensitive data exposed through otherwise normal serialization - Incorrect workflow order, manipulated prices, checkout bypasses, and race conditions - Manual reviews, penetration tests, and bug bounties are difficult to scale or may happen too late. ## AI-Powered Review for Merge Requests - Security Review Flow analyzes the diff alongside original files, related code, and MR discussion. - It can detect missing authorization, information disclosure, mass assignment, business-logic flaws, and stateful workflow races. - An independent validation pass reviews findings to filter likely false positives. - GitLab’s application security team has used it on internal merge requests. ## Findings and Review Workflow - Findings appear as diff threads and an internal summary; public projects keep security details in the internal note. - Each finding includes: - Vulnerability type and CWE reference - Severity from critical to low - Tier: exploitable, logic flaw, or design issue - Explanation and suggested remediation - Critical and high findings request changes; medium and low findings generate comments. - The tool never approves an MR, leaving the final decision to a human. - Developers can discuss findings, apply suggested fixes, dismiss false positives, accept risks, and request another review after changes. ## Availability and Cost - The feature is in public beta for GitLab Ultimate customers on GitLab.com, Self-Managed, and Dedicated. - Access is available through a Duo Agent Platform trial or included GitLab Credits. - Pricing depends on diff complexity and model selection, so GitLab recommends testing it on a limited number of MRs first. Organizations should use Security Review Flow as an additional layer alongside scanners and expert review, applying it early in the merge-request process when security fixes are least expensive.