CVE-2025-6386 Timing Attack Vulnerability in parisneo/lollms
Attackers can enumerate valid usernames and guess passwords by analyzing response time differences in the authentication function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-6386?
CVE-2025-6386 is a high-severity vulnerability in parisneo/lollms, published on 7 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-203
Which versions are affected by CVE-2025-6386?
3 open source packages ship an affected version, including lollms.
| Package | Affected | Fixed in |
|---|---|---|
lollms PyPI | All versions to 11.0.0 | None |
lollms PyPI | All versions to 11.0.0 | None |
lollms PyPI | All versions to 11.0.0 | None |
How do I fix CVE-2025-6386?
No fix has been published for CVE-2025-6386 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-6386 being exploited?
There is no known exploitation of CVE-2025-6386 in the wild and no public exploit code.
Sources
Also known as GHSA-j5pr-vrjj-9v4h, PYSEC-2026-1590.