Bug 2498211 (CVE-2026-59948)

Summary: CVE-2026-59948 composer/composer: Composer: Arbitrary file write via crafted package name
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 the PHP language. A remote attacker could exploit this vulnerability by providing a maliciously crafted package from an untrusted source. During installation or update, Composer's improper validation of package names allows it to write attacker-controlled files outside of designated directories. This could lead to arbitrary file write, potentially compromising the integrity of the system.
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Description OSIDB Bzimport 2026-07-08 20:02:31 UTC 
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project during install or update by using an invalid package name that is not correctly validated before dependency-resolution results are written or installed. This issue is fixed in versions 2.2.29 and 2.10.2.