medium4.7
CVE-2026-59947
Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | composer/composer | >= 2.3.0, < 2.10.2 | 2.10.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-g6xq-892h-64w3
- https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3
- https://nvd.nist.gov/vuln/detail/CVE-2026-59947
- https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8
- https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ec
- https://github.com/composer/composer/releases/tag/2.10.2
- https://github.com/composer/composer/releases/tag/2.2.29