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The HIPAA Breach Report for November 2026 analyzes protected health information (PHI) breaches affecting 500 or more people as reported to the Department of Health and Human Services (HHS) in October 2026.
This report covers:
- HIPAA breaches ranked by people affected
- HIPAA breaches ranked by occurrence
- Year-over-year comparison
- Takeaways
- Full data
HIPAA breaches ranked by people affected
Most common breaches by type
- Network server breaches affected the most people. 10,106,558 individuals had their data breached.
- Electronic medical record breaches were the second most common breach, with 64,728 people affected.
- Other breaches affected 34,828 people, the third most impactful breach type.
HIPAA breaches ranked by occurrence
Most common breach types
- Network server was the most common attack vector. There were 27 network server breaches.
- Other breaches were the second most common attack vector, with 5 breaches.
- Email breaches were the third most common attack vector, with 4 breaches.
Year-over-year comparison
These charts compare the HIPAA data breach statistics from previous Paubox HIPAA Breach Reports (November 2022, November 2023, November 2024, and November 2025) with this month’s report.
HIPAA breaches ranked by people affected
What we observe
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Network server breaches affected the most people in October 2026, with 10,106,558 individuals impacted.
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The number of people affected by network server breaches was the highest in five years, up from 1,419,860 in 2025.
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Electronic medical record breaches rose to 64,728, up from 20,081 in 2025.
HIPAA breaches ranked by occurrence
What we observe
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Network server breaches continue to be the most frequent attack vector, accounting for 27 incidents in October 2026, up from 22 in 2025.
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Email breaches dropped to 4 incidents, down from 6 in 2025, continuing a decline from 15 in 2024.
Takeaways
Network server breaches affected the most people in October 2026. iRhythm Technologies, Inc. had the most significant breach, which affected 8,179,772 people. Central Ohio Primary Care Physicians, Inc. (COPC) had the second-largest breach, affecting 1,351,650 people. The yearly comparison shows that network server breaches remain the most popular attack vector for bad actors.
Overall, 10,116,362 individuals had their data accessed via 34 breaches reported in October 2026.
Full data
Click here to view the HHS’ raw data via Google Sheets.
About the Paubox HIPAA Breach Report
The Paubox HIPAA Breach Report analyzes recent PHI breaches that affected 500 or more individuals, as reported on the HHS Wall of Shame in October 2026.
SEE ALSO: HIPAA Compliant Email: The Definitive Guide
Robust inbound email security is a necessity for businesses today. Keeping your email security strategy updated helps ensure the protection of your network.
