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

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Summary

CVECVE-2026-59947
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 20:16:59 UTC
Updated2026-07-08 20:16:59 UTC
DescriptionComposer 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-532 | CWE-532 CWE-532: Insertion of Sensitive Information into Log File

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Composer Composer affected >= 1.0, < 2.2.29 Not specified
CNA Composer Composer affected >= 2.3.0, < 2.10.2 Not specified

References

ReferenceSourceLinkTags
github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda0... [email protected] github.com
github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1f... [email protected] github.com
github.com/composer/composer/releases/tag/2.10.2 [email protected] github.com
github.com/composer/composer/releases/tag/2.2.29 [email protected] github.com
github.com/composer/composer/security/advisories/GHSA-g6xq-892h-64w3 [email protected] github.com
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