### [CVE-2021-20270](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20270)
![](https://img.shields.io/static/v1?label=Product&message=python-pygments&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-835&color=brighgreen)

### Description

An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpuoct2021.html

#### Github
- https://github.com/HotDB-Community/HotDB-Engine
- https://github.com/asa1997/topgear_test
- https://github.com/doudoudedi/hackEmbedded