PYSEC-2026-1509

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/langchain/PYSEC-2026-1509.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1509
Aliases
Published
2026-07-07T11:45:32.931836Z
Modified
2026-07-07T17:56:41.991383859Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
langchain Server-Side Request Forgery vulnerability
Details

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/langchaincommunity/documentloaders/recursiveurlloader.py#L51-L51

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

References

Affected packages

PyPI / langchain

Package

Name
langchain
View open source insights on deps.dev
Purl
pkg:pypi/langchain

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.1.0

Affected versions

0.*
0.0.1
0.0.2
0.0.3
0.0.4
0.0.5
0.0.6
0.0.7
0.0.8
0.0.9
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0.0.45
0.0.46
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Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/langchain/PYSEC-2026-1509.yaml"