VNX-252 – Unchecked Return Value

Overview

VNX-252 maps to CWE-252: Unchecked Return Value. Detects source patterns associated with CWE-252 (Unchecked Return Value). Each finding should be manually reviewed for exploitability in context.

Severity: Medium | CWE: CWE-252 | Languages: c, cpp, go

Why This Matters

This weakness class (Unchecked Return Value) creates a concrete exploit surface: the rule searches for the concrete source-level patterns most commonly associated with CWE-252 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 '.Write(' pattern
.Write(

// FLAGGED: contains 'malloc(' pattern
malloc(

Remediation

  1. Review each flagged line and determine whether the pattern represents a real instance of CWE-252 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-252 comment on the line.
  4. Ensure equivalent test coverage exists to prevent regression.

References