| Component | LangChain |
| Severity | medium (CVSS 4.7) |
| CVSS vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2024-06-06 |
| Last modified | 2026-06-17 |
| Affected versions | < 0.2.5 from the GitHub-reviewed advisory GHSA-3hjh-jh2h-vrg6 |
| Fixed in | 0.2.5 |
| Weakness | CWE-674 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade LangChain to
0.2.5or later. - Do not expose the component's API or UI to the internet without authentication in front of it.