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Yale New Haven Health Confirms Data Breach Exposed 5.56 Million Patient Records

The healthcare network has notified affected individuals, launched an investigation with Mandiant, and faces class action lawsuits as attackers remain unidentified.

Yale New Haven Hospital in New Haven, Connecticut. Officials say that Yale-New Haven Hospital is waiting for test results on a patient who recently traveled to Liberia and was admitted Wednesday night with a fever. They confirmed that the patient was one of the Yale University student researchers that helped monitor the Ebola outbreak in Liberia last month. That student had been tested in Liberia and had negative results.. USA. 16th October 2014. Photo Tim Clayton (Photo by Tim Clayton/Corbis via Getty Images)
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Overview

  • The breach, reported on March 11, 2025, exposed sensitive personal information of 5,556,702 patients, including Social Security numbers and demographic details.
  • Yale New Haven Health engaged Mandiant and federal authorities to investigate the incident, which disrupted IT systems but did not impact patient care.
  • Exposed information did not include financial or medical treatment details, and impacted individuals are being offered free credit monitoring and identity protection services.
  • Class action lawsuits are being prepared on behalf of affected patients, seeking compensation for the exposure of their sensitive data.
  • No ransomware group or threat actor has claimed responsibility for the attack, leaving the perpetrators and their motives unknown.