CVE-2025-6386: Timing Attack Vulnerability in parisneo/lollms

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-07 · updated 2026-06-17
Weakness: CWE-203

Description

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/lollms: before 20.1 — fixed in 20.1

How to fix

Upgrade to a fixed version: parisneo/lollms 20.1. Check the vendor advisory for mitigations.

References

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