Today we’re releasing Composer 2.7.7 (PHP 7.2+) and 2.2.24 (LTS for use on PHP 5.3 to 7.1) to address two security vulnerabilities as well as a number of smaller security hardening measures, please update to the new versions immediately (e.g. with composer self-update ). The problems detailed in this post were identified by security firm Cure53 as part of an audit performed over the last weeks on