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CVE-2026-59947

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

Published: Jul 8, 2026Updated: Jul 10, 2026 Sources: CVE List NVDCWE-532
4.7MEDIUM
NVD MITRE
EPSS Score
0.1%
Top 97.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-532

Affected Products

composer
oss-project
composerLibrary
DevTools & CI / artifact-registry

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://github.com/composer/composer/commit/6bd66874ae523ecb69aca5964487a0cdfda03ef8
github.com
https://github.com/composer/composer/commit/8887ad76fbd830cb1861a2b1fd8ead78ed1fa1ec
github.com
https://github.com/composer/composer/releases/tag/2.10.2
github.com
and 2 more references View all →

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