CVEs-PoC/2021/CVE-2021-23509.md

### [CVE-2021-23509](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23509)
![](https://img.shields.io/static/v1?label=Product&message=json-ptr&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%203.0.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Prototype%20Pollution&color=brighgreen)

### Description

This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.

### POC

#### Reference
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1767165
- https://snyk.io/vuln/SNYK-JS-JSONPTR-1577291

#### Github
- https://github.com/dellalibera/dellalibera