CVE-2021-41116: Getcomposer Composer

Critical severity, CVSS 9.8. EPSS: 2.8% chance of exploitation in the next 30 days.

Composer is an open source dependency manager for the PHP language. In affected versions windows users running Composer to install untrusted dependencies are subject to command injection and should upgrade their composer version. Other OSs and WSL are not affected. The issue has been resolved in composer versions 1.10.23 and 2.1.9. There are no workarounds for this issue.

Affected products

• Getcomposer Composer: before 1.10.23 (fixed in 1.10.23); from 2.0.0, before 2.1.9 (fixed in 2.1.9)
• Tenable Tenable.sc: before 5.21.0 (fixed in 5.21.0)

Published 2021-10-05. Last modified 2026-06-17.