CVE-2025-6386: Parisneo Parisneo/lollms

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The parisneo/lollms repository is affected by a timing attack vulnerability in the `authenticate_user` function within the `lollms_authentication.py` file. This vulnerability allows attackers to enumerate valid usernames and guess passwords incrementally by analyzing response time differences. The affected version is the latest, and the issue is resolved in version 20.1. The vulnerability arises from the use of Python's default string equality operator for password comparison, which compares characters sequentially and exits on the first mismatch, leading to variable response times based on the number of matching initial characters.

Affected products

• Parisneo Parisneo/lollms: before 20.1 (fixed in 20.1)

Published 2025-07-07. Last modified 2026-06-17.