---
id: CVE-2025-6386
aliases:
  - GHSA-j5pr-vrjj-9v4h
  - PYSEC-2026-1590
title: >-
  Lord of Large Language Models vulnerable to Observable Discrepancy attack via
  authenticate_user function
summary: >-
  Lord of Large Language Models vulnerable to Observable Discrepancy attack via
  authenticate_user function
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
vendor: lollms
product: lollms
ecosystem: pip
affected:
  - lollms <= 11.0.0
published: '2025-07-07'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-j5pr-vrjj-9v4h'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-6386'
  - url: >-
      https://github.com/parisneo/lollms/commit/f78437f7b5aa39a78c6201912faf4e0645a38c48
  - url: 'https://github.com/ParisNeo/lollms'
  - url: 'https://huntr.com/bounties/6da05485-d219-4f18-9ffc-991053524b67'
tags:
  - osv
  - pip
epss: 0.00371
epssPercentile: 0.28383
ingestedAt: '2026-07-08T18:25:50.586Z'
---

## Overview

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 commit f78437f. 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 packages

- `lollms <= 11.0.0`

## Remediation

Refer to the advisory for the patched release.