Bug 2498194 (CVE-2026-59946)

Summary: CVE-2026-59946 composer: Composer: Insecure file permissions leading to information disclosure and potential execution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Composer, a dependency manager for PHP. A malicious package can exploit a vulnerability in Composer's binary installation process by using specially crafted path segments. This allows an existing file on the host system to have its permissions changed to be world-readable and world-executable. This can lead to sensitive information disclosure and potentially allow an attacker to execute arbitrary code.
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Description OSIDB Bzimport 2026-07-08 20:01:34 UTC 
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. This issue is fixed in versions 2.2.29 and 2.10.2.