cve/2021/CVE-2021-27291.md

CVE-2021-27291

Description

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

POC

Reference

No PoCs from references.

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/HotDB-Community/HotDB-Engine
• https://github.com/asa1997/topgear_test
• https://github.com/doyensec/regexploit
• https://github.com/engn33r/awesome-redos-security
• https://github.com/retr0-13/regexploit