Do not exploit it. Report it responsibly.
Summary: Fixed handling of code read from STDIN to prevent PHP parse errors and improve compatibility with heredoc/nowdoc input. Ensures input is trimmed correctly, fallback encoding handling added, and edge-case empty input is safely ignored.
The path vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php refers to a critical Remote Code Execution (RCE) vulnerability known as . This flaw allows unauthenticated attackers to execute arbitrary PHP code on a server if the PHPUnit library is exposed to the internet. The Core Vulnerability: CVE-2017-9841
