AI agent vulnerability · LangChain

CVE-2024-0243: langchain Server-Side Request Forgery vulnerability

lowCVSS 3.0 3.7GHSA-h9j7-5xvc-qhg5

With the following crawler configuration: An attacker in control of the contents of https://example.com could place a malicious HTML file in there with links like "https://example.completely.different/myfile.html" and the crawler would proceed to download that file as well even though preventoutside=True.

Published Feb 26, 2024 · Updated Mar 17, 2026

Affected packages

langchain

Ecosystem: PyPI
Affected: < 0.1.0
Fixed in: 0.1.0
Check: pip show langchain

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

With the following crawler configuration:

from bs4 import BeautifulSoup as Soup

url = "https://example.com"
loader = RecursiveUrlLoader(
    url=url, max_depth=2, extractor=lambda x: Soup(x, "html.parser").text 
)
docs = loader.load()

An attacker in control of the contents of https://example.com could place a malicious HTML file in there with links like "https://example.completely.different/my_file.html" and the crawler would proceed to download that file as well even though prevent_outside=True.

https://github.com/langchain-ai/langchain/blob/bf0b3cc0b5ade1fb95a5b1b6fa260e99064c2e22/libs/community/langchain_community/document_loaders/recursive_url_loader.py#L51-L51

Resolved in https://github.com/langchain-ai/langchain/pull/15559

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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