---
title: "engine.io — CVE-2026-102599"
description: "A denial of service flaw affects the npm package engine.io. Affected versions: >= 6.6.0, < 6.6.10. Fixed from version 6.6.10. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-29-cve-2026-102599
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-29
dateModified: 2026-09-29
---
# engine.io — CVE-2026-102599

A denial of service flaw affects the npm package engine.io. Affected versions: >= 6.6.0, < 6.6.10. Fixed from version 6.6.10. CVSS score 7.5.

## What to do

Update engine.io to 6.6.10 or later.

| Fact | Value |
| --- | --- |
| Package | engine.io |
| Ecosystem | npm (JavaScript) |
| Class | Denial of service |
| Affected versions | >= 6.6.0, < 6.6.10 |
| Fixed version | 6.6.10 |
| CVSS | 7.5 |
| CVE | CVE-2026-102599 |
| GHSA | GHSA-2gc4-cqfq-p2gv |
| Published on | September 29, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-2gc4-cqfq-p2gv](https://github.com/advisories/GHSA-2gc4-cqfq-p2gv) — GitHub Security Advisories
- [NVD — CVE-2026-102599](https://nvd.nist.gov/vuln/detail/CVE-2026-102599) — NVD

---

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Published by InYourGeek — https://inyourgeek.com/en/a-propos
Method and safeguards : https://inyourgeek.com/en/methode
Full register : https://inyourgeek.com/en/failles-de-securite