CPAN.org Combolist Leak: How 1,882 Developer Logins Leaked

CPAN.org Combolist: 1,882 Developer Logins Exposed

In June 2026, HEROIC analysts identified a combolist tied to cpan.org, uploaded to a Telegram channel by an anonymous user. The file contained 1,882 records pairing email addresses with plaintext passwords, along with the URLs each credential pair was tied to. CPAN, the Comprehensive Perl Archive Network, is used heavily by software developers, which means the accounts in this list likely belong to programmers and technical users rather than the general public.

Why This Is Dangerous

Developer accounts often carry more risk than a typical login because the same person may reuse a password across code repositories, package registries, or server admin panels. An attacker who successfully logs into one developer account tied to this leak could potentially pivot toward source code, deployment credentials, or other technical infrastructure if passwords were shared across systems. Because the data is stored in plaintext, no decryption is needed, whoever holds the file can attempt logins immediately.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the associated accounts

Why This Matters

This leak is a textbook example of how combolists power credential stuffing. Once a list like this circulates, automated tools test each email and password pair against many other websites, betting that people reuse logins. For the 1,882 people in this file, that means real exposure to account takeover, unauthorized access, or identity theft if the same credentials unlock email, banking, or other personal accounts elsewhere.

How a Combolist Attack Works

A combolist is simply a file of email or username and password pairs, usually assembled from older breaches, malware infections, or scraped leaks and organized around a theme, in this case, accounts associated with cpan.org. Criminals distribute these files on platforms like Telegram, where other attackers download them and feed them into automated login tools that try each pair across a wide range of sites. Because the passwords here were never hashed or encrypted, the file is dangerous the moment it starts circulating.

Check If You Are Affected

If you have ever used a cpan.org account or reused a password across developer tools, it is worth checking your exposure now. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records and will tell you instantly if you show up. If you find a match, change that password everywhere it was reused and consider a password manager to avoid repeating logins across accounts.