Medium 4.7Published Jul 8, 2026

CVE-2026-59947Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)

Updated under an hour ago (Oct 26, 2026, 10:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-532
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

composer composer composer:composer (from the name)	from 1.0, < 2.2.29; from 2.3.0, < 2.10.2	CNA record

References

References

https://github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3	x-refsource-confirm
https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8	x-refsource-misc
https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ec	x-refsource-misc
https://github.com/composer/composer/releases/tag/2.10.2	x-refsource-misc
https://github.com/composer/composer/releases/tag/2.2.29	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.