---
title: "yayson — CVE-2026-61534"
description: "A remote code execution flaw affects the npm package yayson. Affected versions: <= 4.2.0. Fixed from version 4.3.0. CVSS score 9.1."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-11-cve-2026-61534
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-11
dateModified: 2026-09-11
---
# yayson — CVE-2026-61534

A remote code execution flaw affects the npm package yayson. Affected versions: <= 4.2.0. Fixed from version 4.3.0. CVSS score 9.1.

## What to do

Update yayson to 4.3.0 or later.

| Fact | Value |
| --- | --- |
| Package | yayson |
| Ecosystem | npm (JavaScript) |
| Class | Remote code execution |
| Affected versions | <= 4.2.0 |
| Fixed version | 4.3.0 |
| CVSS | 9.1 |
| CVE | CVE-2026-61534 |
| GHSA | GHSA-325j-mg25-8q58 |
| Published on | September 11, 2026 |
| Severity | Critical |

## Sources

- [GitHub Security Advisory — GHSA-325j-mg25-8q58](https://github.com/advisories/GHSA-325j-mg25-8q58) — GitHub Security Advisories
- [NVD — CVE-2026-61534](https://nvd.nist.gov/vuln/detail/CVE-2026-61534) — NVD

---

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