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Internet and computer basics

Software defect

A problem that makes a program behave differently from what was intended, such as showing the wrong information or stopping a task. It can happen without an attack.

On this site

This category covers program defects that cause problems such as displaying the wrong information. It is distinct from an incorrect setting or an intrusion. In the JRE ID incident, an update duplicated user identifiers, creating a possibility that linked services would show another user’s ID. [1]

Example incidents

Related terms

Sources

  1. [1][Official]JRE IDサービスにおけるシステム不具合に伴うお客さま情報の誤表示についてJR East · 2026-11-04