Bug 2498208 (CVE-2026-59947)

Summary: CVE-2026-59947 composer/composer: Composer: Information disclosure of credentials via debug output
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Composer, a dependency manager for the PHP language. When Composer is executed with the `-vvv` debug verbosity option, it can inadvertently expose sensitive credentials, such as a GitHub Personal Access Token, by printing them in the debug output. This occurs because certain internal components fail to properly sanitize username-only URL credentials. A local user with access to the debug output could exploit this to gain unauthorized access to resources.
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Description OSIDB Bzimport 2026-07-08 20:02:21 UTC
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.