CWE-1126
Weakness AllowedDeclaration of Variable with Unnecessarily Wide Scope
Abstraction: Base · Status: Incomplete
The source code declares a variable in one scope, but the variable is only used within a narrower scope.
Mapping guidance
This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Modes of introduction
Detection methods
Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
Content history
Entry derived from Common Quality Enumeration (CQE) Draft 0.9.
updated Description
updated Relationships
updated Mapping_Notes
updated Applicable_Platforms, Common_Consequences, Description, Detection_Factors, Time_of_Introduction
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