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CVSS: 8.8EPSS: 11%CPEs: 6EXPL: 1

Composer is a dependency manager for PHP. URLs for Mercurial repositories in the root composer.json and package source download URLs are not sanitized correctly. Specifically crafted URL values allow code to be executed in the HgDriver if hg/Mercurial is installed on the system. The impact to Composer users directly is limited as the composer.json file is typically under their own control and source download URLs can only be supplied by third party Composer repositories they explicitly trust to download and execute source code from, e.g. Composer plugins. • https://blog.sonarsource.com/php-supply-chain-attack-on-composer https://getcomposer.org https://github.com/composer/composer/security/advisories/GHSA-h5h8-pc6h-jvvx https://lists.debian.org/debian-lts-announce/2021/05/msg00009.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FAQUAMGO4Q4BLNZ2OH4CXQD7UK4IO2GE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KN3DMFH42BJW45VT6FYF2RXKC26D6VC2 https://www.debian.org/security/2021/dsa-4 • CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') CWE-94: Improper Control of Generation of Code ('Code Injection') •