CVE-2026-59947: Composer

Medium severity, CVSS 4.7. EPSS: 0.1% 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, when Composer is run with -vvv debug verbosity, it could print a credential embedded in the username slot of a repository or package URL, such as a GitHub Personal Access Token in https://TOKEN@host/, to debug output because AuthHelper, Url::sanitize, and ProcessExecutor did not sanitize username-only URL credentials. 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.