Z-lib
HIGH RISKData breach — June 2024
In June 2024, almost 10M user records from Z-lib were discovered exposed online. Now defunct, Z-lib was a malicious clone of Z-Library, a well-known shadow online platform for pirating books and academic papers. The exposed data included usernames, email addresses, countries of residence, Bitcoin and Monero cryptocurrency wallet addresses, purchases and bcrypt password hashes.
search Check if you were affected — freeData exposed in this breach
What happened in the Z-lib data breach?
In June 2024, almost 10M user records from Z-lib were discovered exposed online. Now defunct, Z-lib was a malicious clone of Z-Library, a well-known shadow online platform for pirating books and academic papers. The exposed data included usernames, email addresses, countries of residence, Bitcoin and Monero cryptocurrency wallet addresses, purchases and bcrypt password hashes.
The exposed data included 6 types of personal information. Because passwords were exposed, users who reused their password on other sites are at particular risk. Learn more about what a data breach means for you.
Quick answer — was Z-lib hacked?
Yes. Z-lib was breached in June 2024. The breach exposed 9,737,374 records including cryptocurrency wallet addresses, email addresses, geographic locations. This breach has been independently verified. If your email was involved, your data may still be at risk today. Check if you were affected.
Why was the Z-lib breach so dangerous?
The Z-lib breach exposed 9,737,374 records — that is 9.7M people whose personal data is now circulating on the dark web. The combination of cryptocurrency wallet addresses, email addresses, geographic locations makes this a high-risk breach that requires immediate action.
Because passwords were exposed, attackers can use credential stuffing to automatically test your Z-lib password against hundreds of other websites. If you reused your password anywhere, those accounts are now at risk. Read more about what happens to your data after a breach.
Don't wait to find out — check if your email was exposed in this breach now.
What data was stolen in the Z-lib breach?
Cryptocurrency wallet addresses — combined with other data, used for identity theft and physical fraud
Email addresses — used for phishing attacks and credential stuffing against your other accounts
Geographic locations — may be combined with other breach data to build a profile for targeted attacks
Passwords — can be used to access your accounts directly or cracked to reveal your actual password
Purchases — may be combined with other breach data to build a profile for targeted attacks
Usernames — used to build profiles and target you with personalised scams
Is the Z-lib breach still dangerous in 2026?
Yes. Stolen data from the Z-lib breach remains dangerous years after the incident. Research shows that over 65% of stolen credentials from older breaches have never been changed by the account holders. Attackers routinely compile data from multiple breaches to build complete profiles, and credentials from 2024 are still actively used in credential stuffing attacks today.
Personal information like email addresses, phone numbers, and dates of birth never expire. Even if you changed your Z-lib password, the other exposed data can be combined with information from other breaches to target you. Learn more about how long stolen data stays dangerous.
Frequently asked about the Z-lib breach
Approximately 9,737,374 user records were exposed in the Z-lib breach in June 2024.
Yes. Leaked credentials are actively used in credential stuffing attacks years after a breach. If you reused your Z-lib password elsewhere and haven't changed it, those accounts remain at risk today.
Enter your email in the free checker on EmailLeaked. We scan 12 billion+ breach records including the full Z-lib dataset and tell you instantly whether your email was exposed and what data was taken.
Change your Z-lib password immediately, change any other account where you used the same password, enable two-factor authentication on all important accounts, and monitor for phishing emails over the next 90 days.
Who was affected by the Z-lib breach?
The Z-lib data breach affected approximately 9,737,374 users who had accounts with the service. While not the largest breach on record, it still represents a significant number of compromised accounts in our database of 970+ known breaches.
If you ever created an account with Z-lib or used their services, your data may have been included in this breach. Check your email now to find out. You can also read our guide on what to do immediately after a data breach.
If your email was in the Z-lib breach
Change your Z-lib password immediately
Go to Z-lib and change your password right now. Use a strong, unique password that you have never used anywhere else.
Change any account sharing that password
If you used the same password on other sites, change it on every one of them. Attackers test stolen credentials on hundreds of popular sites within hours.
Enable two-factor authentication
Turn on 2FA on Z-lib and every important account. Even if your password is known, attackers cannot get in without the second factor.
Check your other accounts for this breach
Run a full email check to see every breach your email appears in — not just this one.
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