What Is Reachability Analysis and Why Does It Matter?

Reachability analysis is a critical technique in cybersecurity that determines whether vulnerable code within an application can actually be executed, thus helping security teams prioritize real risks over false positives. Unlike traditional scanners that indiscriminately flag vulnerabilities based on package matches, reachability analysis builds a call graph to trace the execution paths in the code, identifying only those vulnerabilities that are truly exploitable. This approach, which has gained importance amidst a surge in reported CVEs, offers three distinct methods—static, dynamic, and runtime analysis—each with varying degrees of accuracy and coverage. Different types of reachability analysis, from function-level to internet exposure, cater to specific needs, providing a more granular assessment of risk. However, many tools claiming to offer reachability analysis fall short due to incomplete call graphs or insufficient integration depth, making it essential for organizations to evaluate tools based on evidence, accuracy, and remediation guidance. Endor Labs stands out by offering full-stack reachability analysis that spans first-party code, dependencies, and container images, providing verified, evidence-backed findings that significantly reduce noise and enhance trust in vulnerability assessments. As the cybersecurity landscape evolves, the emphasis has shifted from merely providing reachability analysis to offering comprehensive, evidence-driven insights that enable effective risk management and remediation.

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