Vendor Phpunit Phpunit Src Util Php Eval-stdin.php Exploit Fixed Jun 2026

Run this command from your project root to see if you are vulnerable:

The attacker sends the crafted malicious code to the server through the vulnerable eval-stdin.php file, which then evaluates and executes the code.

PHPUnit is the de facto standard for unit testing in PHP applications. Due to its widespread inclusion in development dependencies (via Composer), its footprint is massive within the PHP ecosystem. Historically, developers have often inadvertently committed development dependencies to production servers or failed to exclude the vendor directory from web server document roots. vendor phpunit phpunit src util php eval-stdin.php exploit

Once RCE is confirmed, an attacker can deploy:

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Run this command from your project root to

The vulnerability in the eval-stdin.php script within PHPUnit's src/util directory is a critical issue that can lead to arbitrary code execution. It is essential to understand the technical details of the vulnerability, its impact, and potential exploits to ensure the security of PHPUnit-based applications. By updating PHPUnit, disabling the vulnerable script, or implementing security controls, you can mitigate the risk associated with this vulnerability.

Let’s look at the actual source code of eval-stdin.php (simplified for clarity): If you share with third parties, their policies apply

In many shared hosting or poorly configured nginx/Apache setups, the web root points to the project root (where vendor/ lives) instead of a /public subdirectory. This exposes every vendor file to the world.

Based on this report, we recommend:

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eval('?>' . file_get_contents('php://input'));