CVE-2026-59946: Composer

Medium severity, CVSS 6.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.

Affected products

• Composer Composer: from 1.0, before 2.2.29 (fixed in 2.2.29); from 2.3.0, before 2.10.2 (fixed in 2.10.2)

Published 2026-07-08. Last modified 2026-07-10.