CVE-2026-46420

EIP tracks 1 public exploit for CVE-2026-46420. PoCs published by Jvr2022.

AI-analyzed exploit summary This PoC demonstrates a command injection vulnerability in `shivammathur/setup-php` GitHub Action (versions >= 2.25.0, < 2.37.1) where malicious PHP version strings in `composer.json` are improperly sanitized, allowing arbitrary command execution during workflow runs.

setup-php is a GitHub action to set up PHP with extensions, php.ini configuration, coverage drivers, and tools. From 2.25.0 prior to 2.37.1, shivammathur/setup-php resolves the PHP version from repository-controlled files such as .php-version, composer.lock through platform-overrides.php, and composer.json through config.platform.php, and insufficiently constrains those values before incorporating them into generated shell or PowerShell setup scripts, allowing command injection on a GitHub Actions runner when workflows such as pull_request_target check out attacker-controlled contents before invoking setup-php. This issue is fixed in version 2.37.1.