Description
The source code declares a variable in one scope, but the variable is only used within a narrower scope.
Potential Impact
Other
Reduce Maintainability, Increase Analytical Complexity
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 sea
Related Weaknesses
Frequently Asked Questions
What is CWE-1126?
CWE-1126 (Declaration of Variable with Unnecessarily Wide Scope) is a software weakness identified by MITRE's Common Weakness Enumeration. It is classified as a Base-level weakness. The source code declares a variable in one scope, but the variable is only used within a narrower scope.
How can CWE-1126 be exploited?
Attackers can exploit CWE-1126 (Declaration of Variable with Unnecessarily Wide Scope) to reduce maintainability, increase analytical complexity. This weakness is typically introduced during the Implementation phase of software development.
How do I prevent CWE-1126?
Follow secure coding practices, conduct code reviews, and use automated security testing tools (SAST/DAST) to detect this weakness early in the development lifecycle.
What is the severity of CWE-1126?
CWE-1126 is classified as a Base-level weakness (Medium abstraction). Its actual severity depends on the specific context and how the weakness manifests in your application.