Common Weakness Enumeration

    CWE Definition / CWE-758

    CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

    The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.

    Published:3 Mar 2009
    Organization:MITRE
    Modified:11 Dec 2025

    Related Weakness

    CWE-710: Improper Adherence to Coding Standards