symfony/runtime is a module for the Symphony PHP framework which enables decoupling PHP applications from global state. When the "register_argv_argc" php directive is set to "on" , and users call any URL with a special crafted query string, they are able to change the environment or debug mode used by the kernel when handling the request. As of versions 5.4.46, 6.4.14, and 7.1.7 the "SymfonyRuntime" now ignores the "argv" values for non-SAPI PHP runtimes. All users are advised to upgrade. There are no known workarounds for this vulnerability.