CVE-2026-59947
Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)
- State
- Published
- Severity
- 4.7 Medium
- Published
- Jul 8, 2026
- Updated
- Jul 9, 2026
- Reserved
- Jul 7, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.7 Medium | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
Weaknesses
- CWE-532 Insertion of Sensitive Information into Log File
Affected Products
| Product | Versions |
|---|---|
composercomposer |
|
References
- https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3
- 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
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