langchain-ai langchain-community up to 0.4.2 Sitemap Loader sitemap.py SitemapLoader.parse_sitemap server-side request forgery

Summaryinfo

A vulnerability labeled as problematic has been found in langchain-ai langchain-community up to 0.4.2. Impacted is the function SitemapLoader.parse_sitemap of the file langchain_community/document_loaders/sitemap.py of the component Sitemap Loader. Executing a manipulation can lead to server-side request forgery. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is registered as CVE-2026-72848. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in langchain-ai langchain-community up to 0.4.2 and classified as problematic. This vulnerability affects the function SitemapLoader.parse_sitemap of the file langchain_community/document_loaders/sitemap.py of the component Sitemap Loader. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. CVE summarizes:

SitemapLoader.parse_sitemap in langchain_community/document_loaders/sitemap.py applies the documented restrict_to_same_domain control only to leaf url entries. The loop over url elements filters cross-domain locations, but the loop over nested sitemap elements passes the child loc straight to self.scrape_all([loc.text], "xml"), which reaches WebBaseLoader.scrape_all and an aiohttp GET, with no domain comparison and no check for private, loopback or link-local destinations. An attacker who controls or influences an ingested sitemap can therefore point a nested sitemap entry at an internal address and make the server fetch it even when the deploying application set restrict_to_same_domain to True specifically to confine outbound requests. The fetched content is parsed and surfaces in the returned Documents, so internal responses are disclosed to the caller rather than merely requested.

The advisory is available at github.com. This vulnerability was named CVE-2026-72848 since 08/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/21/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• langchain-ai

Name

• langchain-community

Version

• 0.4.0
• 0.4.1
• 0.4.2

Support

• end of life

CPE 2.3info

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• 🔒
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CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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