GHSA-cmh5-qc8w-xvcq

Affected versions of `i18next` may fail to sanitize user input when certain configuration options are used. When using the `.init` method, passing interpolation options without passing an `escapeValue` will default to `undefined` rather than the assumed `true`.

## Proof of Concept

```js var init = i18n.init({ interpolation: { prefix: "__", suffix: "__", escapeValue: true } }, function(){ var test = i18n.t('__firstName__ __lastName__', { firstName: 'Bob', lastName: '["foo","bar"]', }); console.log(test); }); ``` When `escapeValue` is explicitly passed, the result of `test` is:

```html <script>alert(1)</script> Johnson ```

This is supposed to be the default. However, if `escapeValue` is not included, the result is the unescaped string: ```html <script>alert(1)</script> Johnson ```

## Recommendation

Update to version 3.4.4 or later.