# Declaration of Catch for Generic Exception (CWE-396)

Catching overly broad exceptions defeats the purpose of typed exceptions and can result in unexpected behavior.

- Prevalence: 聚焦 覆盖 1 种语言
- Impact: 中 建议审查
- Prevention: 已记录 1 个修复示例

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

## Description

When exceptions are caught too broadly (e.g., catching Exception instead of specific types), the code may inadvertently catch and suppress exceptions it wasn't designed to handle, hiding bugs or security issues.

## Prevention

### Python

Catch specific exceptions instead of bare except: or except BaseException

## Warning Signs

- [LOW] overly broad exception handlers (bare except: or except BaseException)
that catch system exceptions 

## Consequences

- 拒绝服务 (DoS)
- 隐藏活动

## Mitigations

- 只捕获你知道如何处理的具体异常类型
- 对无法妥善处理的异常进行重新抛出
- 在重新抛出之前记录意外异常

## Detection

- Total rules: 1
- Languages: python

## Rules by Language

### Python (1 rules)

- **Overly Broad Exception Handler** [LOW]: Detects overly broad exception handlers (bare except: or except BaseException)
that catch system exceptions like KeyboardInterrupt, SystemExit, which should
not be caught in normal error handling.
  - Remediation: Catch specific exceptions or use Exception instead of bare except or BaseException.

```python
try:
    process_data()
except ValueError as e:
    logger.error(f"Invalid value: {e}")
except IOError as e:
    logger.error(f"IO error: {e}")
```

Learn more: https://shoulder.dev/learn/python/cwe-396/broad-exception