| Component | LangChain |
| Severity | critical (CVSS 9.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2023-09-01 |
| Last modified | 2026-06-17 |
| Affected versions | langchain = 0.0.245 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-94 |
| CISA KEV | not listed |
NVD description
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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep LangChain off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2023-39631
- https://github.com/langchain-ai/langchain/issues/8363
- https://github.com/pydata/numexpr/issues/442
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