Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-59947US | — | — | ||
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 usern… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8WEB
- https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ecWEB
- https://github.com/composer/composer/releases/tag/2.10.2WEB
- https://github.com/composer/composer/releases/tag/2.2.29WEB
- https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-59947WEB
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