Read the Composer 2.7 Release Announcement for more details on the release highlights and the security fix.

Common upgrade problems

• If you see errors with missing commands (symfony-cmd: command not found) or other failures and you are relying on plugins and running Composer as root (for example when you use AWS ElasticBeanstalk), read https://github.com/composer/composer/issues/11839
• If you are using plugins and bitbucket pipelines, read https://github.com/composer/composer/issues/11839
• If you see Fatal error: Declaration of {some-class}::execute(...) must be compatible with Composer\Command\SomeCommand::execute(): int then whatever code is extending a Composer command needs to be updated to also add the int return type, see https://github.com/composer/composer/issues/11843 for more details.

Complete Changelog

• Security: Fixed code execution and possible privilege escalation via compromised vendor dir contents (GHSA-7c6p-848j-wh5h / CVE-2024-24821)
• Changed the default of the audit.abandoned config setting to fail, set it to report or ignore if you do not want this, or set it via COMPOSER_AUDIT_ABANDONED env var (#11643)
• Added --minimal-changes (-m) flag to update/require/remove commands to perform partial update with --with-dependencies while changing only what is absolutely necessary in transitive dependencies (#11665)
• Added --sort-by-age (-A) flag to outdated/show commands to allow sorting by and displaying the release date (most outdated first) (#11762)
• Added support for --self combined with --installed or --locked in show command, to add the root package to the package list being output (#11785)
• Added severity information to audit command output (#11702)
• Added scripts-aliases top level key in composer.json to define aliases for custom scripts you defined (#11666)
• Added IPv4 fallback on connection timeout, as well as a COMPOSER_IPRESOLVE env var to force IPv4 or IPv6, set it to 4 or 6 (#11791)
• Added support for wildcards in outdated's --ignore arg (#11831)
• Added support for bump command bumping * to >=current version (#11694)
• Added detection of constraints that cannot possibly match anything to validate command (#11829)
• Added package source information to the output of install when running in very verbose (-vv) mode (#11763)
• Added audit of Composer's own bundled dependencies in diagnose command (#11761)
• Added GitHub token expiration date to diagnose command output (#11688)
• Added non-zero status code to why/why-not commands (#11796)
• Added error when calling show --direct <package> with an indirect/transitive dependency (#11728)
• Added COMPOSER_FUND=0 env var to hide calls for funding (#11779)
• Fixed bump command not bumping packages required with a v prefix (#11764)
• Fixed automatic disabling of plugins when running non-interactive as root
• Fixed update --lock not keeping the dist reference/url/checksum pinned (#11787)
• Fixed require command crashing at the end if no lock file is present (#11814)
• Fixed root aliases causing problems when auditing locked dependencies (#11771)
• Fixed handling of versions with 4 components in require command (#11716)
• Fixed compatibility issues with Symfony 7
• Fixed composer.json remaining behind after a --dry-run of the require command (#11747)
• Fixed warnings being shown incorrectly under some circumstances (#11786, #11760, #11803)