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Add security warning #46

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Jul 1, 2024
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Add security warning #46

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8 changes: 6 additions & 2 deletions readme.md
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Expand Up @@ -7,7 +7,6 @@ Really Fast Deep Clone
[![coverage](https://img.shields.io/codecov/c/github/davidmarkclements/rfdc.svg)](https://codecov.io/gh/davidmarkclements/rfdc)
[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)


## Usage

```js
Expand Down Expand Up @@ -171,11 +170,16 @@ All files | 100 | 100 | 100 | 100 | |
### `__proto__` own property copying

`rfdc` works the same way as `Object.assign` when it comes to copying `['__proto__']` (e.g. when
an object has an own property key called '__proto__'). It results in the target object
an object has an own property key called '__proto__'). It results in the target object
prototype object being set per the value of the `['__proto__']` own property.

For detailed write-up on how a way to handle this security-wise see https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning/.

## Security

Like `Object.assign()`, rdfc does not offer any protection against prototype poisoning. In other terms,
if you clone an object that has a `__proto__` property, the target object will have the prototype set.

## License

MIT
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