Yale New Haven Health System, Connecticut's largest healthcare network, agreed to pay $18 million to settle a class action lawsuit following a major data breach in March that affected nearly 5.6 million individuals. The breach, which was discovered on March 8 after "unusual activity" was detected in the organization's IT systems, involved unauthorized third-party access to sensitive health data, making it the largest health data breach reported to federal regulators in 2025. The settlement received preliminary court approval, with a final hearing scheduled for March 2026.
The breach impacted a wide range of individuals associated with Yale New Haven Health, which employs over 12,000 staff and 4,500 physicians across Connecticut. The organization publicly disclosed the incident on March 11, and the legal resolution was reached relatively quickly, about seven months after the disclosure. Details regarding the specific nature of the compromised data or the attack vector have not been disclosed, but the scale of the breach and the rapid legal settlement underscore the significant impact on the healthcare sector and affected individuals.

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Yale New Haven Health agreed to pay $18 million to settle litigation stemming from a hack, according to reports published on October 24, 2025. The references do not provide additional dated details about the underlying incident or settlement timeline.
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