# CVE-2023-39631: Langchain vulnerable to arbitrary code execution via the evaluate function in the numexpr library

Source: https://junglewise.ai/threats/cve-2023-39631-langchain-vulnerable-to-arbitrary-code-execution-via-the-evaluate  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-09-01  
License: CC BY 4.0 with a link back

CVE-2023-39631 · Severity: low · CVSS 3.1 · Published 2023-09-01

An issue in LanChain-ai Langchain v.0.0.245 allows a remote attacker to execute arbitrary code via the evaluate function in the numexpr library.

Technologies: [langchain (PyPI)](https://junglewise.ai/threats/technologies/langchain). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2023-39631 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-39631 being exploited in the wild.

**How severe is CVE-2023-39631?** Low severity, with a CVSS score of 3.1, published 1 September 2023.

**Which products and versions are affected?** langchain (PyPI) ECOSYSTEM:introduced=0,fixed=0.0.308; numexpr (PyPI) ECOSYSTEM:introduced=0,fixed=2.8.5.

**Is there a fix for CVE-2023-39631?** Yes. langchain (PyPI): upgrade to 0.0.308 or later; numexpr (PyPI): upgrade to 2.8.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-39631?** Check whether you run langchain (PyPI) or numexpr (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- langchain (PyPI): upgrade to 0.0.308 or later

  ```sh
  pip install "langchain>=0.0.308"
  ```

- numexpr (PyPI): upgrade to 2.8.5 or later

  ```sh
  pip install "numexpr>=2.8.5"
  ```


## Affected products

- langchain (PyPI) ECOSYSTEM:introduced=0,fixed=0.0.308
- numexpr (PyPI) ECOSYSTEM:introduced=0,fixed=2.8.5

## Identifiers

- CVE-2023-39631
- GHSA-f73w-4m7g-ch9x
- PYSEC-2023-162
- PYSEC-2023-163

## Related threats

- [PYSEC-2026-2561 - Denial of service in langchain-community](https://junglewise.ai/threats/cve-2024-2965-langchain-sitemaploader-denial-of-service-via-infinite-recursion)
- [PYSEC-2026-1507 - Langchain SQL Injection vulnerability](https://junglewise.ai/threats/cve-2024-8309-langchain-sql-injection-vulnerability)
- [PYSEC-2026-1514 - LangChain pickle deserialization of untrusted data](https://junglewise.ai/threats/cve-2024-5998-langchain-pickle-deserialization-of-untrusted-data)
- [PYSEC-2026-1510 - langchain vulnerable to path traversal](https://junglewise.ai/threats/cve-2024-3571-langchain-vulnerable-to-path-traversal)
- [PYSEC-2026-1509 - langchain Server-Side Request Forgery vulnerability](https://junglewise.ai/threats/cve-2024-0243-langchain-server-side-request-forgery-vulnerability)