New PHP Composer Flaws Enable Arbitrary Command Execution — Patches Released

Two high-severity command injection vulnerabilities have been discovered in Composer, a widely-used PHP package manager. The flaws affect the Perforce VCS (version control software) driver and could enable remote attackers to execute arbitrary commands on vulnerable systems. CVE-2026-40176 is among the disclosed vulnerabilities with a high CVSS score. Successful exploitation poses significant risk to development environments, CI/CD pipelines, and servers running Composer with Perforce integration. Organizations should immediately apply available patches, verify Perforce VCS driver configurations, and restrict access to untrusted repositories as mitigation measures.

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 discovered in Composer, a widely-used PHP package manager. The flaws affect the Perforce VCS (version control software) driver and could enable remote attackers to execute arbitrary commands on vulnerable systems. CVE-2026-40176 is among the disclosed vulnerabilities with a high CVSS score. Successful exploitation poses significant risk to development environments, CI/CD pipelines, and servers running Composer with Perforce integration. Organizations should immediately apply available patches, verify Perforce VCS driver configurations, and restrict access to untrusted repositories as mitigation measures. 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