CVE-2026-59947

MEDIUM4.7

Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)

Published Jul 8, 2026

Modified 2 weeks ago

Details

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.

References

WEB

https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8

WEB

https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ec

WEB

https://github.com/composer/composer/releases/tag/2.10.2

WEB

https://github.com/composer/composer/releases/tag/2.2.29

WEB

https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3

ADVISORY