SAST vs Code Review
How SAST differs from manual secure code review, what each technique can examine, and how automated analysis and human judgment work together.
Primary question: How does automated static analysis differ from manual secure code review?
Direct answer
SAST provides repeatable automation; code review provides human context and judgment
SAST applies encoded analysis rules consistently across supported code, while manual secure code review uses human understanding of architecture, intent, trust boundaries, and business logic. [nist-ssdf][owasp-code-review]
Mature review workflows use SAST to produce repeatable code-level evidence and human review to validate findings and examine risks that automated rules do not model adequately. [nist-ssdf]
Definitions
Static Application Security Testing (SAST)
Automated analysis of source code and supported code-level data flows without executing the application.
Secure code review
Human examination of source code and design context to identify security weaknesses, unsafe assumptions, and violations of security requirements.
Review coverage
The code, weakness classes, control flows, and security assumptions examined by a particular review or analysis activity.
The engineering problem
Manual review can focus deeply on intent and design but is constrained by available reviewer time and the scope selected for examination. [owasp-code-review]
Automated analysis can examine large volumes of supported code consistently but cannot infer every application-specific security requirement or business rule. [owasp-source-code-analysis]
Treating either technique as complete can leave unexamined weaknesses or produce security decisions without sufficient context.
Security controls
Each control inspects a different artifact and produces evidence for an engineering decision.
Automated static analysis
Static Application Security Testing- Artifact
- Supported source code and code-level data flows.
- Risk
- Repeatable implementation weaknesses that can be detected through static rules and semantic analysis.
- Output
- Findings with code location, weakness classification, and analysis context.
Evidence: OWASP Source Code Analysis ToolsDerScanner static analysis documentation
Human secure code review
Secure Code Review- Artifact
- Source code, design intent, security requirements, trust boundaries, and surrounding application context.
- Risk
- Security weaknesses dependent on application-specific behavior, assumptions, or design decisions.
- Output
- Review observations, validated findings, design concerns, and remediation recommendations.
Evidence: OWASP Code Review Guide
Verification workflow
- Define the code revision, security requirements, and review scope.
- Run SAST against the supported source code.
- Use findings and analysis paths to focus reviewer attention.
- Review application-specific authorization, trust boundaries, and business logic.
- Validate each material finding against actual code and intended behavior.
- Remediate confirmed weaknesses and record justified dispositions.
- Re-run SAST and review security-sensitive changes before acceptance.
DerScanner · Enterprise
Relationship to DerScanner
DerScanner provides automated static analysis evidence that can support, focus, and complement human secure code review.
DerScanner reports source-code findings and analysis context for supported programming languages. [derscanner-sast][derscanner-supported-languages]
Limits of verification
- SAST cannot replace human understanding of business logic or intended authorization policy.
- Human review does not guarantee consistent examination of every code path or weakness class.
- SAST findings require validation and can include false positives.
- Review quality depends on reviewer expertise, available context, and allocated time.
- Combining techniques broadens evidence but does not prove that no vulnerability remains.
Related knowledge
What Is SAST?
Definition and operating model of static application security testing
Relationship: related-toValidate SAST Findings
How engineers examine and disposition automated findings
Relationship: related-toSecurity Review of AI-Generated Code
Applying independent review to code produced by AI systems
Relationship: related-toCanonical terms used: Static Application Security Testing; secure code review; automated code analysis; manual review; finding validation.
Evidence and references
- NIST Secure Software Development FrameworkSecure development practices include reviewing and analyzing code using human and automated approaches and addressing identified vulnerabilities.
nist-ssdf - OWASP Code Review GuideSecure code review examines source code for security weaknesses using reviewer knowledge and application context.
owasp-code-review - OWASP Source Code Analysis ToolsAutomated source-code analysis has repeatable strengths and technique-specific limitations.
owasp-source-code-analysis - DerScanner static analysis documentationDerScanner provides automated static analysis of source code.
derscanner-sast - DerScanner analysis modules and supported languagesDerScanner documents the language and file-type scope of its static analyzers.
derscanner-supported-languages
Combine automation with engineering judgment