People search Yale New Haven Health data breach timeline because regulated data and trust are existential—one incident triggers class actions and regulator exams. BreachHistory indexes 2 Yale New Haven Health-linked incidents, with headline counts up to 5.6M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Yale New Haven Health breach history matters
Yale New Haven Health operates in Healthcare (United States). Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2025 — 5.5M patients
Cataloged incident. Connecticut's largest healthcare provider reported unauthorized access discovered March 8, 2025. Largest healthcare breach reported in 2025. Exposed data included names, birthdates, phone numbers, addresses, email, race/ethnicity, medical record numbers, and Social Security numbers. Exposed categories include Names, birthdates, phone numbers, addresses, email, race/ethnicity, medical record numbers, Social Security numbers. BreachHistory cites approximately 5.5M+ affected records in this row. See the yale-new-haven-health2025 and canonical BreachHistory entry.
2025 — 5.6M patient records
Cataloged incident. Connecticut's largest healthcare provider suffered a network intrusion in March 2025 exposing patient names, SSNs, medical record numbers, and demographic information for over 5.5 million individuals. Exposed categories include Names, SSNs, medical record numbers, demographic information. BreachHistory cites approximately 5.6M+ affected records in this row. See the yale-new-haven-health2025a and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple Yale New Haven Health catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Watch for medical-ID theft and billing fraud after health-data incidents.
- Step 5: Bookmark the Yale New Haven Health company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/yale-new-haven-health · Latest: yale-new-haven-health2025.
Sources: BreachHistory catalog (2 rows for Yale New Haven Health), company and regulator disclosures cited in individual breach records.