New PHP Composer Flaws Enable Arbitrary Command Execution — Patches Released

Two high-severity command injection vulnerabilities have been disclosed in Composer, the popular PHP package manager. The flaws affect the Perforce VCS (version control software) driver, enabling attackers to achieve arbitrary command execution on targeted systems. CVE-2026-40176 is among the identified vulnerabilities. Organizations using Composer with Perforce integration should apply available patches immediately. Successful exploitation could allow attackers to execute malicious commands with the privileges of the Composer process, potentially leading to system compromise, data exfiltration, or further network propagation. Mitigation includes updating Composer to the latest patched version and restricting access to untrusted package repositories.

Two high-severity security vulnerabilities have been disclosed in Composer, a package manager for PHP, that, if successfully exploited, could result in arbitrary command execution. The vulnerabilities have been described as command injection flaws affecting the Perforce VCS (version control software) driver. Details of the two flaws are below - CVE-2026-40176 (CVSS

Two high-severity command injection vulnerabilities have been disclosed in Composer, the popular PHP package manager. The flaws affect the Perforce VCS (version control software) driver, enabling attackers to achieve arbitrary command execution on targeted systems. CVE-2026-40176 is among the identified vulnerabilities. Organizations using Composer with Perforce integration should apply available patches immediately. Successful exploitation could allow attackers to execute malicious commands with the privileges of the Composer process, potentially leading to system compromise, data exfiltration, or further network propagation. Mitigation includes updating Composer to the latest patched version and restricting access to untrusted package repositories. Two high-severity security vulnerabilities have been disclosed in Composer, a package manager for PHP, that, if successfully exploited, could result in arbitrary command execution. The vulnerabilities have been described as command injection flaws affecting the Perforce VCS (version control software) driver. Details of the two flaws are below - CVE-2026-40176 (CVSS Two high-severity security vulnerabilities have been disclosed in Composer, a package manager for PHP, that, if successfully exploited, could result in arbitrary command execution. The vulnerabilities have been described as command injection flaws affecting the Perforce VCS (version control software) driver. Details of the two flaws are below - CVE-2026-40176 (CVSS