[HIGH] Ability to enable/disable object support in YAML parsing and dumping

PKSA-t2pc-z7zq-cy53 CVE-2013-1397 GHSA-7w53-hfpw-rg3g

Affected package: symfony/symfony

Affected version: >=2.0.0,<2.0.22|>=2.1.0,<2.1.7

Reported by:
GitHub, FriendsOfPHP/security-advisories