[MEDIUM] SS-2018-019: Possible denial of service attack vector when flushing

PKSA-phcb-cpj7-6d3j GHSA-468j-6jrc-2rjx

Affected package: silverstripe/framework

Affected version: >=4.0.0,<4.0.5|>=4.1.0,<4.1.3|>=4.2.0,<4.2.2

Reported by:
GitHub, FriendsOfPHP/security-advisories