# Integer Overflow or Wraparound (CWE-190)

The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value.

**Stack:** Go

- Prevalence: 中 3 言語をカバー
- Impact: ミディアム レビュー推奨
- Prevention: 文書化済み 3 件の修正例

**OWASP:** Security Misconfiguration (A05:2021-Security Misconfiguration) - #5

## Description

An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits. This can lead to buffer overflows, incorrect financial calculations, or security bypasses.

## Prevention

1 件の Shoulder 検出ルールに基づく Integer Overflow の予防策。

### Go

Validate bounds before arithmetic operations with user-controlled integers

## Consequences

- DoS
- 未承認コードの実行
- アプリケーションデータの変更

## Mitigations

- 整数オーバーフローを検出する言語またはライブラリを使用する
- 入力が期待される範囲内にあることを検証する
- オーバーフローを検出する安全な算術関数を使用する

## Detection

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

## Rules by Language

### Go (1 rules)

- **Integer Overflow via Unchecked Arithmetic** [MEDIUM]: User-controlled integer used in arithmetic or allocation without bounds checking.
  - Remediation: Validate bounds before arithmetic operations with user input.

```go
count, err := strconv.Atoi(r.URL.Query().Get("count"))
if err != nil || count < 0 || count > 10000 {
    return errors.New("invalid count")
}
buffer := make([]byte, count*1024)
```

Learn more: https://shoulder.dev/learn/go/cwe-190/integer-overflow