VNX-563 – Assignment to Variable without Use

Overview

VNX-563 maps to CWE-563: Assignment to Variable without Use. Detects source patterns associated with CWE-563 (Assignment to Variable without Use). Each finding should be manually reviewed for exploitability in context.

Severity: Low | CWE: CWE-563 | Languages: python

Why This Matters

This weakness class (Assignment to Variable without Use) creates a concrete exploit surface: the rule searches for the concrete source-level patterns most commonly associated with CWE-563 and surfaces them for review. Each finding should be evaluated in context — the rule catches the pattern, not the context.

What Gets Flagged

// FLAGGED: contains 'x = ' pattern
x =

Remediation

  1. Review each flagged line and determine whether the pattern represents a real instance of CWE-563 or a false positive.
  2. Replace the flagged construct with a documented safe alternative appropriate to your language and framework.
  3. For confirmed false positives, add a # vulnetix-ignore: VNX-563 comment on the line.
  4. Ensure equivalent test coverage exists to prevent regression.

References