CVE-2025-6208 Uncontrolled Memory Consumption in run-llama/llama_index
Attackers can cause memory exhaustion in llama_index by exploiting a flaw where file limits are applied after loading all files into memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-6208?
CVE-2025-6208 is a medium-severity denial of service vulnerability in run-llama/llama_index, published on 2 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The `SimpleDirectoryReader` component in `llama_index.core` version 0.12.23 suffers from uncontrolled memory consumption due to a resource management flaw. The vulnerability arises because the user-specified file limit (`num_files_limit`) is applied after all files in a directory are loaded into memory. This can lead to memory exhaustion and degraded performance, particularly in environments with limited resources. The issue is resolved in version 0.12.41.
Weakness: CWE-400
Which versions are affected by CVE-2025-6208?
3 open source packages ship an affected version, including llama-index-core.
| Package | Affected | Fixed in |
|---|---|---|
llama-index-core PyPI | All versions | 0.12.41 |
llama-index-core PyPI | All versions | 0.12.41 |
llama-index-core PyPI | All versions | 0.12.41 |
How do I fix CVE-2025-6208?
Upgrade llama-index-core to 0.12.41 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-6208 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-6208 exists.
Sources
Also known as GHSA-488g-hw5f-x29p, PYSEC-2026-1560.