---
title: "undici — CVE-2026-19534"
description: "A denial of service flaw affects the npm package undici. Affected versions: >= 6.7.0, < 6.28.1. Fixed from version 6.28.1. CVSS score 7.5."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-29-cve-2026-19534
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-29
dateModified: 2026-09-29
---
# undici — CVE-2026-19534

A denial of service flaw affects the npm package undici. Affected versions: >= 6.7.0, < 6.28.1. Fixed from version 6.28.1. CVSS score 7.5.

## What to do

Update undici to 6.28.1 or later.

| Fact | Value |
| --- | --- |
| Package | undici |
| Ecosystem | npm (JavaScript) |
| Class | Denial of service |
| Affected versions | >= 6.7.0, < 6.28.1 |
| Fixed version | 6.28.1 |
| CVSS | 7.5 |
| CVE | CVE-2026-19534 |
| GHSA | GHSA-rfgv-xxqx-mfg5 |
| Published on | September 29, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-rfgv-xxqx-mfg5](https://github.com/advisories/GHSA-rfgv-xxqx-mfg5) — GitHub Security Advisories
- [NVD — CVE-2026-19534](https://nvd.nist.gov/vuln/detail/CVE-2026-19534) — NVD

---

Equivalent HTML page : https://inyourgeek.com/en/failles-de-securite/2026-09-29-cve-2026-19534
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