PYSEC-2026-1509
Published: 7 Jul 2026Last Modified: 7 Jul 2026
Summary: langchain Server-Side Request Forgery vulnerability
Details: With the following crawler configuration:
```python
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
Package
Name: langchain
Purl: pkg:pypi/langchain
Affected ranges
Type: ECOSYSTEM
Events:
Introduced- 0
Fixed -0.1.0
0.0.1
0.0.10
0.0.100
0.0.101
0.0.101rc0
0.0.102
0.0.102rc0
0.0.103
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0.0.34
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