Regular expression Denial of Service (ReDoS) in EmailValidator class in V7 compatibility module in Vaadin 8

Unsafe validation RegEx in EmailValidator component in com.vaadin:vaadin-compatibility-server versions 8.0.0 through 8.12.4 Vaadin versions 8.0.0 through 8.12.4 allows attackers to cause uncontrolled resource consumption by submitting malicious email addresses...