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Have I Been Pwned Adds 1.3 Billion Unique Passwords From Synthient Collection

The expansion draws on aggregated leaks and infostealer logs, heightening credential-stuffing risk for anyone reusing passwords.

Overview

  • Following the update, the service tracks about 2 billion unique compromised email addresses, with 625 million of the newly added passwords not previously seen in HIBP.
  • Troy Hunt validated portions of the corpus by contacting subscribers, confirming that some passwords were decades old while others were still in active use.
  • The data originated from openly accessible cloud storage, Telegram groups and prior breaches, and includes credentials harvested by infostealer malware.
  • All added passwords are now in the Pwned Passwords tool as hashes without associated emails, enabling privacy-preserving checks by individuals and organizations.
  • Checks highlight the persistence of weak choices, with the password “123456” appearing in 178,863,340 records.