MEDIUM 4.7

PYSEC-2024-118

Details

A Denial-of-Service (DoS) vulnerability exists in the `SitemapLoader` class of the `langchain-ai/langchain` repository, affecting all versions. The `parse_sitemap` method, responsible for parsing sitemaps and extracting URLs, lacks a mechanism to prevent infinite recursion when a sitemap URL refers to the current sitemap itself. This oversight allows for the possibility of an infinite loop, leading to a crash by exceeding the maximum recursion depth in Python. This vulnerability can be exploited to occupy server socket/port resources and crash the Python process, impacting the availability of services relying on this functionality.

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Affected packages

PyPI / langchain

Introduced in: 0 Fixed in: 73c42306745b0831aa6fe7fe4eeb70d2c2d87a82

Fix pip install --upgrade 'langchain>=73c42306745b0831aa6fe7fe4eeb70d2c2d87a82'

References

https://huntr.com/bounties/90b0776d-9fa6-4841-aac4-09fde5918cae [EVIDENCE]
https://huntr.com/bounties/90b0776d-9fa6-4841-aac4-09fde5918cae [WEB]
https://github.com/langchain-ai/langchain/commit/73c42306745b0831aa6fe7fe4eeb70d2c2d87a82 [FIX]
https://github.com/advisories/GHSA-3hjh-jh2h-vrg6 [ADVISORY]