cve/2021/CVE-2021-26813.md

### [CVE-2021-26813](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26813)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/doyensec/regexploit
- https://github.com/retr0-13/regexploit