---
title: "undici — CVE-2026-109869"
description: "A denial of service flaw affects the npm package undici. Affected versions: >= 6.23.0, < 6.29.1. Fixed from version 6.29.1. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-10-23-cve-2026-109869
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-23
dateModified: 2026-10-23
---
# undici — CVE-2026-109869

A denial of service flaw affects the npm package undici. Affected versions: >= 6.23.0, < 6.29.1. Fixed from version 6.29.1. CVSS score 7.5.

## What to do

Update undici to 6.29.1 or later.

| Fact | Value |
| --- | --- |
| Package | undici |
| Ecosystem | npm (JavaScript) |
| Class | Denial of service |
| Affected versions | >= 6.23.0, < 6.29.1 |
| Fixed version | 6.29.1 |
| CVSS | 7.5 |
| CVE | CVE-2026-109869 |
| GHSA | GHSA-xjj6-f33q-929c |
| Published on | October 23, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-xjj6-f33q-929c](https://github.com/advisories/GHSA-xjj6-f33q-929c) — GitHub Security Advisories
- [NVD — CVE-2026-109869](https://nvd.nist.gov/vuln/detail/CVE-2026-109869) — NVD

---

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Full register : https://inyourgeek.com/en/failles-de-securite