Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda0
- https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1f
- https://github.com/composer/composer/releases/tag/2.10.2
- https://github.com/composer/composer/releases/tag/2.2.29
- https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3
FAQ
What is CVE-2026-59947?
CVE-2026-59947 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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 reposi...
How severe is CVE-2026-59947?
CVE-2026-59947 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59947?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.