---
title: "composer/composer — CVE-2026-84361"
description: "A remote code execution flaw affects the Composer package composer/composer. Affected versions: >= 2.3.0, < 2.10.3. Fixed from version 2.10.3."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-09-08-cve-2026-84361
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-09-08
dateModified: 2026-09-08
---
# composer/composer — CVE-2026-84361

A remote code execution flaw affects the Composer package composer/composer. Affected versions: >= 2.3.0, < 2.10.3. Fixed from version 2.10.3.

## What to do

Update composer/composer to 2.10.3 or later.

| Fact | Value |
| --- | --- |
| Package | composer/composer |
| Ecosystem | Composer (PHP) |
| Class | Remote code execution |
| Affected versions | >= 2.3.0, < 2.10.3 |
| Fixed version | 2.10.3 |
| CVE | CVE-2026-84361 |
| GHSA | GHSA-rvx4-ffvw-m9q3 |
| Published on | September 8, 2026 |
| Severity | High |

## Sources

- [GitHub Security Advisory — GHSA-rvx4-ffvw-m9q3](https://github.com/advisories/GHSA-rvx4-ffvw-m9q3) — GitHub Security Advisories
- [NVD — CVE-2026-84361](https://nvd.nist.gov/vuln/detail/CVE-2026-84361) — 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