How to Use Reachability to Cut Vulnerability Alerts

Reachability analysis is an application-security technique that determines whether a vulnerable function can be reached from an application’s entry points through its call graph, helping teams distinguish vulnerabilities that are merely present from those that are reachable and potentially exploitable. It complements broad SCA and SAST findings, which often generate large volumes of alerts based on vulnerable dependencies regardless of whether affected code is used, while CVSS measures general severity rather than environment-specific risk. The approach can be performed statically, dynamically, or at runtime, with function-level analysis offering greater precision than dependency- or container-level checks, particularly for transitive dependencies. The text argues that combining reachability with exploit-intelligence signals such as EPSS and CISA’s KEV catalog can sharply reduce remediation queues and focus developers on findings more likely to matter, citing Endor Labs data suggesting roughly 90% or more of reported vulnerabilities may be unreachable. It also notes limitations involving dynamic behavior such as reflection, recommending that tools distinguish confirmed unreachable findings from undetermined ones, and describes full-stack analysis across application code, open-source dependencies, and containers as a way to reduce both false positives and missed cross-layer paths.

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