# Unchecked Error Condition (CWE-391)

The product does not properly check when a function or operation returns a value that is associated with an error condition.

**Stack:** Go

- Prevalence: 中 覆盖 3 种语言
- Impact: 高 1 条严重级别为高的规则
- Prevention: 已记录 3 个修复示例

**OWASP:** Insecure Design (A04:2021-Insecure Design) - #4

## Description

When error conditions are not checked, the application may continue with invalid or unexpected state, potentially leading to crashes, data corruption, or security vulnerabilities.

## Prevention

基于 1 条 Shoulder 检测规则的 Unchecked Error Condition 预防策略。

### Go

Log or return errors instead of silently swallowing them

## Consequences

- 拒绝服务 (DoS)
- 执行未授权代码
- 修改应用程序数据

## Mitigations

- 检查所有返回值与错误条件
- 在适当的地方使用异常处理
- 实现适当的错误恢复机制

## Detection

- Total rules: 3
- Languages: go, javascript, typescript, python

## Rules by Language

### Go (1 rules)

- **Empty Error Handling** [LOW]: Error check block is empty, silently swallowing errors.
  - Remediation: Log or return errors instead of ignoring them silently.

```go
if err != nil {
    log.Printf("operation failed: %v", err)
    return err
}
```

Learn more: https://shoulder.dev/learn/go/cwe-391/empty-error-handling