CVE-2025-6208: Uncontrolled Memory Consumption in run-llama/llama_index

Severity: medium (CVSS 5.3 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: 2026-02-02 · updated 2026-06-17
Weakness: CWE-400

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.

Affected products

run-llama/llama_index: before 0.12.41 — fixed in 0.12.41

How to fix

Upgrade to a fixed version: run-llama/llama_index 0.12.41. Check the vendor advisory for mitigations.

References

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